... security gate, em library security system Model: SSLT-EM-9188 NEWDescriptions:* Material: High quality transparent Acrylic, no deformation, no ... multi-aisles, each aisle can give warning. * High stability, strong anti-electronic jamming ability, can also ... hours Buzzer volume 90dB Alarm sound duration 3s Antenna Power 3.6W-5W Input voltage AC:220V±10% ... 20kg/pce SSLT em security system for library