Features 1、Varied Commands: Has 7 kinds of commands of MOMENTARY, SELF LOCK, INTERLOCK, OPEN, CLOSE, DELAY 1 in SECOND and DELAY 2 in 0.1 SECOND. 2、Simpler Control: Using MS51FB9AE chip as main control, can be used with TB441 infrared remote control and SP485 USB to RS485 converter. 3、Reliable in Use: Designed to have optocoupler, 4 channel relay, digital tube, LED light, button, RS485 and infrared receiver for working. 4、Digital Display: The digital display enables a clear viewing on the working status, which will bring more convenience to your operation. 5、Easy to Install: The work voltage and current are DC 12V, 9-13MA. Also, the installation is very easy with light weight and small size. Specification Item Type: Development Board Model: N722A04 Material: PCB Working Current: 9-13MA IR Remote Control Working Distance: Approx. 8 ~ 16m / 26.25 ~ 52.49ft (receiving sensitivity ≥ 0.5mW/m²) Main Equipment: 4pcs relays, 1pc LED display. Package List 1 x Development Board