Features: Dual power supply (two power supplies cannot be powered at the same time): Power supply 1, DC 6.5-25V; Power supply 2, DC 5V. Standby current (all relays off) 13MA, 1 way relay \''Open\''44MA, 2 way relay\''Open\''76MA, 3 way relay\''Open\''109MA, 4 way relay\''Open\''140MA. Compatible with the CC2541 Bluetooth 4.0 chip . Send commands through the APP compatible with Bluetooth to control the conduction and disconnection of the relay (we provide the APP compatible with Bluetooth you can also use your own APP to control the relay, send a simple command to control). 7 commands:Jog,Self-locking,Interlock Relay "on", relay "off", delay (seconds), delay (0.1 seconds) . Specification: Size:80*66*19mm/3.15*2.6*0.75in Weight:80g/2.82oz Package List: 1*Phone Relay Module Compatible with Bluetooth Note: Open the software to pair directly without a password. The serial port baud rate is 9600. Please do not modify the baud rate, otherwise it will not work.