The TOSR12 Bluetooth relay board provides password authentication and momentary mode, very powerful and easy to use. You can easily control the relay board by your computer or smartphone using Bluetooth.The TOSR12 provides up to 12 volt free contact relay outputs with a current rating of up to 10Amp each. The board is powered from a 5V DC power supply. All relays are SPDT types and each can be set to latching or momentary mode. Here is the Bluetooth APP for TOSR12 Relay Module, you can use this APP to control the relay module easily.