1. Quick Calling: When there is emergency, just push the call button, and the alert message immediately send to the receiver. 2. Stable Signal: The working range can get up to 1000 meters in an open area, making sure that you never loss a call in night. 3. Alerting Mode: Has 3 kinds of alarming modes, flashing and vibration, flashing and buzzer, flashing and vibration and buzzer. 4. Extensive Use: Can be widely applied in home, nursing home, hospital and so on, suits ly for the elderly, patient, etc. 5. Easy Carrying: Comes with a light weight and a compact size as well, for both indoor and outdoor, safeguarding the safety. Item Type: Caregiver Pager Watch Receiver Parameter: Operating Frequency 433.92MHz Charging Voltage: DC5V Working Voltage: DC3.7V Lithium Battery Model: 602030 Battery Capacity: 300mAh, included. Working Current: 100±20mA in vibration and buzzer mode, 75±10mA in vibration mode. Standby Current: 10±5mA Receive Sensitivity: -107±2dBm Decoding: Learning Coding Waterproof Grade: IPX7 Working Temperature: -20℃~ 60℃ Button Launcher Parameter: Operating Frequency 433.92MHz Battery Type: 1 x 23A12V battery. Battery Capacity: 80mAh, included. Emission Current: 10mA±3mA Standby Current: Less than 1uA Open Distance: . 1000m / 3280.84ft Keystrokes: 1000,000 times Waterproof Grade: IPX4 Working Temperature: -20℃ ~ 55℃ Single Key: Call Note: Due to different production batches, there may be slight differences in products. Colour: Black Material: ABS Package Contents: 4 x Receiver 4 x Button 4 x Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.