This product is designed for the security of rental single apartment and commercial housing. Whether you're at home or go out， it'll give you a full range of security， safety of life. Features:100% brand new and high quality.Compact innovative design.One year ultra long battery life.105dB ultra-loud warning sound design.Effectively deter the invasion of thieves.With remote control， much convenient to use.Completely no wiring， easy to install.1 remote control controlling 2 hosts. Specification:Host power: 2*AAA alkaline batteries (not included)Remote control power: 1*12V button battery Standby time: >1 yearOperating temperature: -10~60��Working humidity: <80%Storage temperature: -20~70��Include: 2*hosts， 2*magnet， 1*remote controlNote: Please mount the magnet sensor on the right side of the host and align the two arrows.If the host is installed on the door， install the magnet on the door frame. If the host is installed on the door frame should be a magnet mounted on the door. Package Included:1x remote control1x button battery2x host2x magnet sensor