Resetable hand push button through key via radio design in accordance with EN54-11. Maintain bidirectional communication with the radio interface occupying a direction in the loop module. Dispose of a bicolor LED red/green that provides informations about the status device, signal intensity and batteries status. Includes a surface box and two lithium batteries of 3 volts. Quick, easy and cost-effective installation. Principal battery (CR123) and backup battery (CR2032).