1、4‑way 12V Bluetooth relay module, support 32.8ft control distance in open environment. 2、The relay has a long service life, and it can be connected continuously for 100,000 times. 3、With wireless control function, making it convenient to control and operate. 4、The relay can be controlled by sending instructions through the mobile phone APP. 5、Made of premium PCB, good thermal conductivity and electrical insulation properties. Item Type: Bluetooth Relay Module Material: PCB Working Voltage: DC 12V Control Distance: 10M/32.8ft (open environment) Purpose: 4-channel 12V/10A relay module and SPP-C Bluetooth serial slave module, control the switch of the relay by sending instructions through the mobile phone APP. 1 x Bluetooth Relay Module