About the external features and ports on iMac and iMac Pro

Learn about the external features and ports on the front and rear panel of these computers.

To learn about earlier models, check the product specifications for that model. You can also use the shape of the port to help identify the ports on your Mac.

iMac Pro models introduced in 2017

   

Front panel

Retina 5K display
The bright 27-inch Retina 5K display has 5120 x 2880 resolution and supports P3 wide color.

1080p FaceTime HD camera
Make FaceTime video calls or take pictures and video with the camera at the top of the display. If the light is glowing, the camera is on.

Speakers and microphones
Eliminate unwanted noise, boost your voice, and speak to Siri using the four built-in microphones. Along with the stereo speakers, the mics work to improve your FaceTime and videoconferencing experience.

Rear panel

3.5 mm headphone jack
Plug in stereo headphones to experience high-quality sound while watching movies or listening to your favorite music.

SDXC card slot
Transfer photos, videos, and data to and from your iMac Pro, with high-capacity SD cards. The SDXC card slot supports SD cards with up to UHS-II performance.

USB 3 ports
Connect an iPad, iPhone, iPod, digital camera, camcorder, external storage, or printer quickly and easily. The USB 3 ports on iMac Pro support USB 3 and USB 2 devices.

Thunderbolt 3 (USB-C) ports
Connect Thunderbolt 3 and USB-C devices or displays. Or use an adapter to connect Thunderbolt 2 peripherals, a display or projector, and more.

10 Gigabit Ethernet (RJ-45) port
Nbase-T Ethernet technology supports multiple data rates for speeds up to 10 Gbit/s over standard twisted-pair copper cabling up to 100 meters (328 feet) in length. Depending on the device youʼre connecting to, the cable type and technology used, and the cable length, the highest link speed is automatically negotiated. Learn more about Mac Pro Ethernet speeds.

User-installable VESA mounting bracket

You can replace the stand on your iMac Pro with a VESA mounting bracket. The VESA Mount Adapter Kit allows you to attach your iMac Pro to any VESA-compatible wall mount, desk mount, or articulating arm.


iMac computers introduced in 2017 or later

   

Front panel

Ambient light sensor
Your iMac uses the ambient light sensor to adjust the display's brightness based on your environment.

FaceTime HD camera
You can use the FaceTime HD camera to video chat using FaceTime over a broadband connection, take pictures using Photo Booth, or capture video through iMovie. A green indicator light turns on when the camera is in use.

Mic
The built-in microphone supports recording at bit depths of 16, 20, or 24 bits per sample and at sample rates of 44.1kHz, 48kHz, or 96kHz. Audio recorded from the microphone is presented as a stereo data stream with the same data on both the left and right channels. You can adjust the microphone gain from -16 dB to +30 dB.

Rear panel

3.5 mm headphone jack
The headphone output supports a stereo data stream at bit depths of 16, 20, or 24 bits per sample and at sample rates of 44.1kHz or 48kHz. The headphone output volume can be adjusted from 0.0 dB to -43.0 dB.

During playback of a 1 kHz sine wave at -3 dBFS voltage level, 24-bit sample depth, 44.1kHz output sample rate, and 100k load (unless otherwise specified), the audio output has the following nominal specifications:

  • Jack type: 3.5 mm (1/8-inch) stereo combo
  • Maximum output voltage: 1.4 VRMS (+5.15dBu)
  • Output impedance: <24 ohms
  • Frequency response: 20 Hz to 20 kHz, +0.5dB/-3 dB
  • Signal-to-noise ratio (SNR): >90 dB
  • Total harmonic distortion + noise (THD+N): <-80 dB (0.007%)
  • Channel separation: >85 dB

SDXC (Secure Digital Extended Capacity) card slot 
The built-in SDXC card slot allows your iMac to read and write data to SD media. The slot accepts cards that are Standard SD (Secure Digital) 4MB–4GB, SDHC (Secure Digital High Capacity) 4GB–32GB, and SDXC (Secure Digital Extended Capacity) cards 32GB and larger. Learn more about the SD and SDXC card slot.

USB 3 ports
Your iMac has four USB 3.0-compliant ports. You can connect compliant USB 3.0, USB 2.0, and USB 1.1 devices to these ports. Learn more about using USB devices with Mac computers.

Thunderbolt 3 (USB-C) ports
Your iMac also has two Thunderbolt 3 (USB-C) ports. Thunderbolt 3 is an I/O technology that connects devices to your computer at speeds up to 40 Gbps. Thunderbolt 3 combines data transfer, video output, and charging capabilities in a single, compact connector. It offers faster speeds than Thunderbolt 2: up to 40 Gbps with a Thunderbolt 3-compatible cable. Thunderbolt 3 also supports USB 3.1 Gen 2 connectivity at up to 10 Gbps, and can supply 15 W of power per port to external devices.

Ethernet port (10/100/1000 Base-T)
iMac computers have a built-in Ethernet port for 10Base-T/UTP, 100Base-TX, and 1000Base-T Gigabit operation. You can use an Ethernet cable to connect your iMac to a cable or DSL modem, hub, switch, router, or another Mac computer. The connected device can be either a 10Base-T, 100Base-T, or 1000Base-T device. The port automatically detects which type of device you connect. You don't need to use an Ethernet crossover cable to connect to other Ethernet devices. The Ethernet port supports the configuration of Ethernet frames larger than 1,500 MTU (Maximum Transmission Unit).

Kensington security lock slot
Secure your iMac with its Kensington lock slot, located below the power cord receptacle.


iMac models introduced in 2012 through 2015

   

Front panel

Ambient light sensor
Your iMac uses the ambient light sensor to adjust the display's brightness based on your environment.

Dual mics
The dual microphones operate independently from all other audio input ports and are always available. The built-in microphones support recording at bit depths of 16, 20, or 24 bits per sample and at sample rates of 44.1kHz, 48kHz, or 96kHz. Audio recorded from the microphone is presented as a stereo data stream with the same data on both the left and right channels. You can adjust the microphone gain from -16 dB to +30 dB. Dual microphones enable beam-forming technology, which delivers more accuracy when using dictation and reduces background noise for FaceTime video calls.

FaceTime HD camera
You can use the FaceTime HD camera to video chat using FaceTime over a broadband connection, take pictures using Photo Booth, or capture video through iMovie. A green indicator light turns on when the camera is in use.

Rear panel

3.5 mm headphone jack (line/headphone output)
The headphone output is automatically selected for audio output if no external S/PDIF (Sony/Philips Digital Interface Format) optical digital output device is detected. The headphone output supports a stereo data stream at bit depths of 16, 20, or 24 bits per sample and at sample rates of 44.1kHz or 48kHz, or 96kHz. The headphone output volume can be adjusted from 0.0 dB to -43.0 dB.

During playback of a 1kHz sine wave at -3 dBFS voltage level, 24-bit sample depth, 44.1kHz output sample rate, 100k load (unless otherwise specified), the audio output has the following nominal specifications:

  • Jack type: 3.5 mm (1/8-inch) stereo combo
  • Maximum output voltage: 1.4 VRMS (+5.15dBu)
  • Output impedance: <24 ohms
  • Frequency response: 20Hz to 20kHz, +0.5 dB/-3 dB
  • Signal-to-noise ratio (SNR): >90 dB
  • Total harmonic distortion + noise (THD+N): <-80 dB (0.007%)
  • Channel separation: >85 dB

3.5 mm headphone jack: S/PDIF optical digital output 
The S/PDIF optical digital output is automatically selected when an S/PDIF optical digital output device is detected on the external combination audio port. The S/PDIF optical digital output supports pulse-code modulation (PCM) and Arc Consistency Algorithm #3 (AC-3) audio formats with the following stereo data stream characteristics:

  • PCM: 16, 20, or 24 bits per sample at sample rates of 44.1kHz or 48kHz, or 96kHz
  • AC-3: 16 bits per sample at sample rates of 44.1kHz, 48kHz, 88.2kHz, 96kHz

The S/PDIF optical output channel status conforms to International Electrotechnical Commission (IEC) 60958-3 consumer mode digital audio.

During playback of a 1kHz sine wave (S/PDIF output format at 0 dBFS output level, 44.1kHz sample rate, 24-bit sample depth, unless otherwise specified), the digital audio output has the following nominal specifications:

  • Jack type: 3.5 mm (1/8-inch) stereo combo
  • Digital audio signal-to-noise ratio (SNR): >130 dB
  • Digital audio total harmonic distortion + noise (THD+N): <-130 dB (0.00003%)

SDXC (Secure Digital Extended Capacity) card slot 
The built-in SDXC card slot allows your iMac to read and write data to SD media. The slot accepts cards that are Standard SD (Secure Digital) 4MB–4GB, SDHC (Secure Digital High Capacity) 4GB–32GB, and SDXC (Secure Digital Extended Capacity) cards of 32GB and larger. Learn more about the SD and SDXC card slot.

USB 3 ports
Your iMac has four USB 3.0-compliant ports. You can connect compliant USB 3.0, USB 2.0, and USB 1.1 devices to these ports. Learn more about using USB devices with Mac computers.

Thunderbolt 2 ports
Your iMac also has two ports that support Thunderbolt and Thunderbolt 2. Thunderbolt is an input/output (I/O) technology that supports high-resolution displays and high-performance data devices. Thunderbolt gives you two channels on the same connector, each with 10Gbps of throughput in both directions. 

iMac models introduced in 2014 and 2015 are equipped with Thunderbolt 2, which provides more speed: up to 20 Gbps.

Thunderbolt and Thunderbolt 2 ports support these digital video output modes:

  • Mini DisplayPort output using a Mini DisplayPort to Mini DisplayPort cable (optional)
  • DVI output using a Mini DisplayPort to DVI Adapter (optional)
  • VGA output using a Mini DisplayPort to VGA Adapter (optional)
  • Dual-Link DVI output using Mini DisplayPort to Dual-Link DVI Adapter. Supports 30-inch Apple Cinema HD Display (optional)
  • HDMI audio and video output using a third-party Mini DisplayPort to HDMI Adapter
  • Target Display Mode, which allows some iMac models to be used a display for another Mac when connected using a Thunderbolt to Thunderbolt cable. This feature is not available on iMac models introduced in late 2014 or later.

Ethernet port (10/100/1000 Base-T)
iMac computers have a built-in Ethernet port for 10Base-T/UTP, 100Base-TX, and 1000Base-T Gigabit operation. You can use an Ethernet cable to connect your iMac to a cable or DSL modem, hub, switch, or router, or to another Mac computer. The connected device can be either a 10Base-T, 100Base-T, or 1000Base-T device. The port automatically detects which type of device you connect. You don't need to use an Ethernet crossover cable to connect to other Ethernet devices. The Ethernet port supports the configuration of Ethernet frames larger than 1,500 MTU (Maximum Transmission Unit).

Kensington security lock slot
Secure your iMac with its Kensington lock slot, located below the power cord receptacle.


FaceTime is not available in all countries or regions.

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