Feature: 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 water resistant. Strong anti interference, fast speed and accurate transmission. Operating 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 Li Battery Operating Current: 75±10mA (Vibration, Buzzer Mode) 75±10mA (Vibration Mode) Standby Current:10±5mA Receiving Sensitivity: -107±2dBm Decoding: Studycode Water Resistant Rating: IPX7 Operating Temperature: -20℃-60℃ Battery Type: Li 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: 300mAh (Included) Transmitting Current: 10mA±3mA Standby Current: 10mA Open Range: Approx. 100-200m / 328.1-656.2ft Push Button: 1 Million Times Water Resistant Rating: IPX7 Working Temperature: -20℃-60℃ Single Key: CALL Applicable: Widely used in homes, factories, workshops, clubs, bowling alleys, massage rooms, churches, casinos, golf and country clubs, hospitals, health clubs, elderly call alarms and offices, etc.. Package List: 1 x Watch Receiver3 x Watch Button1 x Power Cord1 x Instruction Manual