In the open environment, the maximum stable transmission distance of the mobile phone when it is carried on the Bluetooth module is 10m; Realize wireless control of mobile phone, switch on and off anytime and anywhere; Mobile APP is connected to Bluetooth control. Mobile APP is easy to configure and operate; Two types of APP are optional, which can be downloaded and controlled wirelessly, and are dedicated to Bluetooth relay; General APP downloaded from Android App Mall; On-board 8-circuit 12V, 10A/250V AC 10A/30V DC relay, capable of continuous closing for 100000 times, with diode leakage protection and short response time