1. CALL: If your family member is in an emergency, press the call button and an alert message will be sent to the recipient immediately.2. STABLE SIGNAL: The working range of this caregiber pager can get up to 800 meters in an open area, making sure that you will never loss a call in night.3. WATERPROOF: This alert button has IPX7 waterproof performance, and the watch has IPX6 waterproof level you do not have to worry about food or water splashing on it, it is also perfect for use in the bathroom.4. PORTABLE DESIGN: Lanyard design, convenient for the elderly or patients to put it around the neck, light weight, small size, which is suitable for indoor and outdoor use, to .5. ALARM MODES: There are several alarm modes, which are light flashing and vibration, flashing and buzzer, flashing and vibration and buzzer.Watch Receiver Parameter:Operating Frequency 433.92MHzCharging Voltage: DC5VWorking Voltage: DC3.7VLithium Battery Model: 602030Battery Capacity: 300mAh, included.Working Current: 10020mA in vibration and buzzer mode, 7510mA in vibration mode.Standby Current: 105mAReceive Sensitivity: -1072dBmDecoding: Learning CodingWaterproof Grade: IPX7Working Temperature: -20- 60Button Launcher Parameter:Operating Frequency 433.92MHzBattery Type: 1 x 23A12V battery.Battery Capacity: 75mAh, included.Emission Current: 10mA3mAKeystrokes: 1000,000 timesWaterproof Grade: IPX6Working Temperature: -20 - 55Single Key: SOSDue to different production batches, there may be slight differences in products.Random color of lanyard,don't accept the specified colorColour:Photo ColorMaterial:PlasticPackage Contents:1 x Receiver1 x Button (Strap color is random,don't accept the specified color)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.