Infrared connectivity is an old wireless technology used to connect two electronic devices. It uses a beam of infrared light to transmit information and so requires direct line of sight and operates only at close range.
IR was superseded by Bluetooth, which has the advantage of operating at longer distances (around 30 feet) and being omni-directional.
Many home devices such as TVs and DVD players still use IR remote controls. Some smartphones are capable of using their IR port to control these devises but that usually requires third-party software.
A-GPS (Assisted GPS) | A2DP (Advanced Audio Distribution Profile) | AAC (Advanced Audio Coding) | Accelerometer | Airplane Mode | Alarm Clock | Alphanumeric | AMOLED display (Active-matrix organic light-emitting diode) | Analog | Android | ANT+ | Antenna | Aperture | APN (Access Point Name) | Apple AirPlay | Apple AirPlay 2 | Apple iOS | Apple iOS 1 | Apple iOS 2 | Apple iOS 3 | Apple iOS 3.2 (iPad Only) | Apple iOS 4 | Apple iOS 5 | Apple iOS 6 | Apple iOS 7 | Apple iOS 8 | Apple iOS 9 | Apple iOS 10 | Apple iOS 11 | Apple iOS 12 | Apple Pay | aptX | Audio Jack | Auto Focus | AVRCP (Audio/Video Remote Control Profile)
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Galileo (Global Navigation Satellite System) | GB (Gigabyte) | Gbps (Gigabits per second) | Geo-Tag | GLONASS (Global Navigation Satellite System) | GPRS | GPS (Global Positioning System) | gpsONE | gpsOneXTRA Assistance Technology | GPU (Graphics Processing Unit)
H.263 | H.264 | H.265 | Half-QWERTY Keyboard Layout | Handwriting Recognition | Haptics | HEVC | Hot Spot | Hot Swap - Definition | HSCSD (High-Speed Circuit Switched Data) | HSDPA (High-Speed Downlink Packet Access) | HSDPA+ (High-Speed Downlink Packet Access Plus) | HSP (Headset Profile) | HSUPA (High-Speed Uplink Packet Access) | HTML (Hypertext Markup Language) | Hz (Hertz)
iDEN (Integrated Digital Enhanced Network) | Image Signal Processor (ISP) | IMAP (Internet Message Access Protocol) | IMEI (International Mobile Equipment Identity) | IP (Internet Protocol) - Definition | IP Ratings | IrDA (Infrared Data Association)
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Talk Time (Battery Life) | TCP/IP - Definition | TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) | TEST | Tethering | Text messaging (texting) | TFD (Thin Film Diode) | TFT (Thin Film Transistor) | Theme | To-Do list | Touchscreen | Trackball | Transflash | Transflective | Tri-band
UFS | UI (User Interface) | UIQ | UMA | UMTS | Unlocked Phone | Upload | UPnP (Universal Plug and Play) | USB (Universal Serial Bus) | USB On-The-Go | USIM
VGA (Video Graphics Array) | Video Call | Video Codec | Voice Dialing | Voice Mail - Definition | Voice Memo - Definition | VoIP (Voice over Internet Protocol) | VPN (Virtual Private Network)
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