1、RF Wireless Technology: RF wireless technology, watch design, easy to use, the transmission distance of indoor partition wall can attain 30 to 200 meters. 2、Rechargeable Battery: IPX7 waterproof, rechargeable battery design, when your electricity runs out, it can be recharged in time, easy to use, suitable for the elderly at home. 3、Prompt Mode: The prompt mode is light flashing and vibration, light flashing and buzzer or light flashing, vibration and buzzer, low power consumption display. 4、ABS Material: The Calling paging system uses strong ABS material, which is wear resistant and durable, and can be used for a long time. 5、Applicable Scenarios: Paging system is suitable for various places such as homes, factories, workshops, general meetings, bowling alleys, massage rooms, churches, casinos, country clubs, hospitals, health clubs, elderly people alarm and offices. Item Type: Wireless Watch Calling System Material: ABS Operating Frequency 433.92MHz Charging Voltage: DC5V Battery Type: 602030 Built in Lithium Battery Capacity: 300mAh (Ship with Inbuilt Battery) Working Current: 100±20mA (Vibration, Buzzer Mode), 75±10mA (Vibration Mode) Standby Current: 10±5mA Receive Sensitivity: -107±2dBm Decoding: Learning Code Waterproof Grade: IPX7 Working Temperature:-20℃ to 60℃ Button Launcher Parameter Description: Operating Frequency: 433.92MHz Battery Model: 12V23A (Included) Battery Capacity: 30mAh (Included) Emission Current: 10mA±3mA Standby Current: