Features: 1.RF Wireless Technology: Wireless caregiver watch features a dot LCD display with RF wireless technology and a stylish watch design 2.Removable Rechargeable Battery: Wireless calling system uses a removable rechargeable battery for long standby times, with rechargeable circuit protection 3.Convenient: A watch can only be equipped with a maximum of 500 pagers, with 10 transmitters and one receiver. Supports the watch call to be modified according to information 4.Supported Functions: Calling caregiver watch supports single or list display mode, accurate time display, vibration and buzzer prompt 5.Scope of Application: Calling caregiver watch can be used at home, hotels, bars, restaurants, factories, clubs, hospitals and offices specification:Item Type: Wireless Caregiver Watch Material: ABS Description of Receiver Parameters of SU R169 Watch: Operating Frequency is 433.92MHz Operating Voltage: DC3.7V Type of Battery: Lithium Battery Battery Capacity: 400mah(included) Operating Current: 57mA10mA (buzzer mode) and 95mA10mA (vibration mode) Standby Current: < 8mA Power Off Current: 1805uA Receiving Sensitivity: -108dBm Decoding: learning Coding Waterproof Grade: IPX4 Operating Temperature: -20~ 55 Parameter Description of Model SU C01 (black) Button Transmitter: Operating Frequency is 433.92MHz Battery: DC12V Type of Battery: Alkaline Battery (23A12V battery) Single Receiver Battery Capacity: 60mAh (included) Emission Current: 10mA3mA Standby Current: < 1uA Open Distance: > 200m Press Key: 1 Million Times Waterproof Frade: IPX4 Operating Temperature: -20~ 55 Single Key: CALL PackageList:1 xWirelessCaregiver WatchReceiver10 xWirelessCaregiver WatchButton1 x User Manual 1xPowerCable10 x Sticker NoteShipped with built in battery