This product combines high frequency wireless transmission technology, digital recognition technology and microcomputer processing technology to realize the remote wireless call function. The system uses millions of learning code chips, with excellent safety performance. Fashion watch design IP6 level waterproof Wireless technology<br><br>Millions of groups learn to code Vibration/buzzer/light flash is optional Low voltage indication Built-in removable, rechargeable lithium battery Intelligent code, easy to use and simple. Suitable for the elderly, the disabled, hospitals, nursing homes, restaurants, kitchens, factories and other call . This series of products are widely used in restaurants, bars, teahouses, hospitals, nursing homes, beauty salons, factories, hotels, residential offices and other service places. The product features excellent, rechargeable battery power, long standby time, with perfect charge and discharge protection circuit; With automatic detection of battery capacity function. When receiving the wireless call signal, the machine send out vibration, buzzer, and flash. Colour:Black Material:ABS<br><br>Package Contents: 1 x Receiver 1 x Transmitter<br><br>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.