Beijing three good professional supplier of library security, library books burglar alarm security instrument, Beijing three Jia Wang Tel: 13693054273 cheap wholesale and retail clothing factory anti-theft, anti-theft supermarket, library security, high-end technology, excellent quality , beautiful appearance of the store to create a safe and secure! Se-4200 Operating Voltage: AC: 220V ± 20%, 50Hz Working environment: -10 ℃ ~ 40 ℃ material: wood detect magnetic length: 6cm above the cobalt-based magnetic theft height: 1500m m burglar width: 800-1000 (mm ) (according to the choice of a magnetic stripe on the length) can be composed of dual-channel or multi-channel. Dimensions: 1450 × 600 × 36 (mm