This elderly alert call button is a reliable life-saving device that works properly at all times. As long as the button is pressed, an SOS signal can be sent to caregivers. With a total of 4 levels of volume, the alert can be customized . It can receive signals up to 30-50m away without obstacles. Note: do not immerse in water. Keep your loved safe with this necessary device. Specification: Product Name: Wireless Call Button Product Size: Button: About 8.5x4.5x2cm/3.35x1.77x0.79in Bell: About 10x6x6cm/3.94x2.36x2.36in Product Weight: About 235g Power Supply Voltage: 5V=2A Power Consumption: Standby 150A Colour: B blue Material:ABS Package Contents: 1 * button 1 * controller 1 * data cable (lanyard 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.