Yealink T55A IP Phone Grey Wired Handset

Features
Product colour The colour e.g. red, blue, green, black, white.	Grey
Handset type	Wired handset
Operating system installed Type of operating system on a device e.g. IOS on Apple devices, Android for mobile devices.	Android
Ethernet cable
Firmware upgradeable
Device lock
Integrated voicemail
Hearing aid compatibility
Dual-Tone Multi-Frequency (DTMF) modes	In-band, Out-of band, SIP info

Display
Display resolution The number of distinct pixels in each dimension that can be displayed. It is usually quoted as width × height, with the units in pixels: for example, "1024 × 768" means the width is 1024 pixels and the height is 768 pixels. The higher the number of pixels, the sharper the image.	480 x 272 pixels
Display diagonal Size of the display for this product, measured diagonally, usually in inches.	10.9 cm (4.3")
Touchscreen A screen of a laptop, smartphone, etc., that responds to touch so you can control the interface using your fingers.
Backlight display A backlight is a form of illumination used in liquid crystal displays (LCDs). As LCDs do not produce light themselves - unlike for example Cathode ray tube (CRT) displays - they need illumination (ambient light or a special light source) to produce a visible image. Backlights are used in small displays to increase readability in low light conditions such as in watches, and in computer displays and LCD televisions to produce light in a manner similar to a CRT display.

Phone features
Call waiting
Intercom
Call hold
Call forwarding
Conference call
Do not disturb function
Call park
Call pick up
Full duplex A full-duplex system allows communication in both directions, and unlike half-duplex, allows this to happen simultaneously.
Call transfer
Message-waiting indicator (MWI)
Call history

Audio
Speakerphone Device has a microphone and loudspeaker provided separately from those in the handset. This device allows multiple persons to participate in a conversation. The loudspeaker broadcasts the voice or voices of those on the other end of the telephone line, while the microphone captures all voices of those using the speakerphone.
Microphone mute
Voice codecs	G.711a,G.722,G.723.1,G.726,G.729A,iLBC
Noise reduction
Voice activity detection
Adaptive jitter buffers
Automatic gain control
Comfort noise generation (CNG)
Packet loss concealment (PLC)

Network
Ethernet LAN An Ethernet LAN (Local Area Network) interface is present, for a wired conection via a cable.
Ethernet LAN interface type The characteristics of the Ethernet LAN interface.	Gigabit Ethernet
Wi-Fi Popular technology that allows an electronic device to exchange data or connect to the internet wirelessly using radio waves.
Bluetooth Bluetooth is a low-power radio technology developed to replace the cables and wires currently used to link or connect electronic devices such as personal computers, printers, and a wide variety of handheld devices including mobile phones. Because it uses radio-wave connectivity, a Bluetooth-enabled device has a constant, established connection to whatever browser it uses. This saves the user the trouble of logging on to check for emails or news updates, for example.
Supported network protocols Network protocols tested as compatible with this product e.g. FTP,HTML, POP.	IPv4/IPv6
Quality of Service (QoS) support
Networking standards The way in which the network is working, e.g. IEEE 802.11a, IEEE 802.11b, IEEE 802.11g.	IEEE 802.1Q,IEEE 802.1p,IEEE 802.1x

Ports & interfaces
USB 2.0 ports quantity Number of USB 2.0 ports (connecting interfaces) in the device. USB 2.0 was released in April 2000 (now called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), USB 2.0 ports are usually black.	1
RJ-9 ports quantity	2
DC-in jack The socket/plug where the DC electricity supply connects to the device.

Camera
Built-in camera The product has an integrated camera.

Power
Power over Ethernet (PoE) The device supports Power over Ethernet (PoE), which is one of several standardized or ad-hoc systems which pass electrical power along with data on Ethernet cabling. This allows a single cable to provide both data connection and electrical power to devices such as wireless access points or IP cameras.
AC adapter input voltage	100 - 240 V
AC adapter output voltage	5 V
AC adapter output current	1.2 A
Power consumption (typical) Amount of power consumed by this model, often expressed in watts (W). Typical values that manufacturers give are power consumption when off, standby/suspended mode, typical use, maximum usage.	2.6 W

Security
Security algorithms Security algorithms are used to provide authentication, cipher key generation, integrity and radio link privacy to users on mobile networks. The security algorithms supported are the ones that can be used with this product.	HTTPS,MD5,SIPS,SRTP

Weight & dimensions
Width The measurement or extent of something from side to side.	223 mm
Depth The distance from the front to the back of something.	206 mm
Height The measurement of the product from head to foot or from base to top.	127 mm

Certificates
Certification	REACH, CE, FC
Skype

Operational conditions
Operating temperature (T-T) The minimum and maximum temperatures at which the product can be safely operated.	0 - 40 °C
Operating relative humidity (H-H)	10 - 95%

Packaging content
Number of handles included The amount of handles, which are the part by which a thing is held, carried or controlled.	1 pc(s)
Manual