DIYMall 4R Bluekey, Channel Relay Module w/Bluetooth 4.0Condition:* New Stock, In OEM Packaging. As Pictured.Additional Notes:* Supply Voltage of The System: 5 Volt* SRD-05VDC-SL-C Relay* Coil Voltage: 5 Volt* Supply Voltage: 5 Volt / From 6 Volt to 24 Volt* Max. Contact Voltage: 250 Volt AC, 125 Volt DC** Maximum Current: 10 Amp* Number of channels: 4* Bluetooth BLE 4.0 Module * Compatible With: Android 4.3 And Newer, And iOS* Dimensions: 66 x 61 mmDIYMall4R Bluekey