On-board loaded 8bit high performance MCU and spp-c bluetooth 2.1 slave module Provide bluetooth relay control app Distance control : 10M (without obstacle ) Working voltage : DC5V On board 2 way 5V,10A/250V AC 10A/30V DC relay, can be used continuously for 100 thousand times, with diode discharge protection within short time. With bluetooth status indicator and relay indicator .Reserved UART debugging interface and MCU program download port.Board size :40*64.5mm, Manufacturer: DollaTek