Features: 1.PROMPT METHOD: Prompting methods are light flash and vibration, light flash and buzzer, light flash, vibration and buzzer, low power consumption display can be flexibly combined. 2.HUMANIZED DESIGN: Restaurant paging system supports 4 channels, each channel supports 5 buttons. One button with multiple watch receivers. 3.WATCH DESIGN: Wireless watch pager has a stylish watch design and is easy to use. Removable rechargeable battery with long standby time and charging circuit protection. 4.ANTI INTERFERENCE: Wrist pager supports IPX7 waterproof. Strong anti interference, fast speed and accurate transmission. Operation range of 100?200m in open distance. 5.APPLICABLE: Wrist pager is widely used in various places such as home, factory, workshop, general assembly, bowling alley, massage room, church, elderly call alarm and office. specification:Item Type: Wireless Wrist Pager Model SU 691 Watch Receiver Parameters Description: Operating Frequency: 433.92MHz Material: ABS Charging Voltage: DC5V Operating Voltage: DC3.7V Rechargeable Lithium Battery Operating Current: 7510mA (Vibration, Buzzer Mode) 7510mA (Vibration Mode) Standby Current:105mA Receiving Sensitivity: -1072dBm Decoding: Studycode Waterproof Rating: IPX7 Operating Temperature: -20-60 Battery Type: Lithium Battery Battery Capacity: 300mAh (Included) Model SU D1 Button Transmitter Parameters Description: Operating Frequency: 433.92MHz Battery Type: Alkaline Battery Battery Type: 12V23A Battery Capacity: 60mAh (Included) Transmitting Current: 10mA3mA Standby Current: