Alarm System, Security Products, Beam Sensor manufacturer / supplier in China, offering Long Launch Distance Black Wireless Waterproof Doorbell with 32 Ringtones (ES-9600dB), 32 Ringtones White Wireless Waterproof Doorbell with Long Launch Distance (ES-9600dB), Tuya 4G + WiFi Alarm System with 7 Wired 99 Wireless Zones (ES-2030GSM) and so on.