Easy to install. To minimize the installation danger and difficulties. Only 12VDC 160~180mA(operating). It is able to use one 1Amp power supply with bolt locks, card readers, and sensors altogether. Position Installation:on top of the door / side of the door. Operating Temperature:-10°C~50°C. Patents in nine countries:China, Japan,Korea, UK, France, Germany, Italy, USA and Taiwan(Patent No.:M362876). Copy Prohibited.