Yealink Ruggedized DECT HandsetYealink W57R, certified to rigorous IP54 standard, is a professional ruggedized DECT handset with an integrated vibration alarm that is pretty eligible for the environment where there may be dusty, humid, and harsh. W57R combines the advantages of wireless communication and the rich features of Voice-over-IP phone, and is fully compatible with Yealink W80/W90 Multi-Cell System for seamless roaming and handover feature. It provides you with the convenience and good experience of mobile communication in and between each zone and keeps stable in complicated and harsh locations. W57R cushions the occasional fall and can easily withstand falls of up to 3.5 meters. This makes the W57R the perfect companion in the office, in a warehouse or on outdoor premises. As a rugged and durable handset, W57R has also been developed with Yealink optimal HD audio quality that combines multiple leading technologies together, including FNR (Flexible Noise Reduction), full duplex, and Opus. This means users can get a stable and high-quality audio experience even if the environment is full of noise or wireless interference. Manufacturer: Yealink Network Technology Co., Ltd. Manufacturer Part Number: W57R. Brand Name: Yealink. Product Name: Ruggedized DECT Handset. Product Type: Handset. [Technical Information] Connectivity Technology: Cordless. Wireless Technology: DECT. Wireless Operating Distance: 984.25 ft. Features: Screen Saver. Caller ID. Backlit Keypad. Auto-answer. Conference Call. DND (Do Not Disturb). Redial. Call Waiting. Mute. Hold. Call Transfer. Speed Dial. Voice Mail. Speakerphone. Noise Reduction. Alarm. Vibrator. [Network & Communication] Frequency Range: 1.88 GHz to 1.93 GHz. [Display & Graphics] Screen Size: 1.8". Screen Type: TFT LCD. Screen Resolution: 128 x 160. [Controls/Indicators] Buttons & Keys: Navigation Key. Soft Ke