Specifications:

• Voice guide: Yes
• Users capacity: 2000
• Suitable for Glass door rhickness: 8-12mm
• Suitable for door type: Glass door.Wooden door,Aluminium Door
• Power supply: 4*AA Alkaline battery
• Operating temperature: -25 - +55degree
• Model Number: FD350
• Brand Name: Realhelp
• Battery life: about 1years. depends one battery