Features: Operating voltage: power supply 1, DC 6.5-25V; power supply 2, DC 5V Operating Current: Standby current (all relays closed) 13MA, 1 relay open 44MA, 2 relays open 76MA, 3 relays open 109MA, 4 relays open 140MA. Send commands via Android Bluetooth APP control relay turned on and off (we provide Bluetooth APP, you can also use your own APP to control relays, sending commands to control). "Momentary" "Self-locking" "Interlock" "open" "close" 5 Commands. External trigger input, photoelectric isolation switch, low pulse inputs. You can modify the Bluetooth name and PIN(Access Password)through AT commands Specifications: Size: as the picture Weight: 77g Communication mode: 2.1 Bluetooth Communication distance: 6-10 m Control mode: Bluetooth wireless remote control relay switch Control port: 4 switches with regular open and close functions Control voltage: AC 85-265v 10A, DC1-110v 10A Bluetooth password: 1234 Package Included: 1 x Bluetooth Relay Module .