Seco-Larm E-931CS22RRCQ Enforcer NIR Retro-Reflective Entry Alert System, Up to 22 ft of Sensing Range, Speaker Volume Adjustment, Adjustable Sounding Time, 9VDC Adapter Included Key Features: - Retro-reflective design - Perfect for monitoring an entrance or use as an entrance indicator - Will make "ding-dong" sound or siren sound when the beam is interrupted - Speaker volume can be adjusted or turned off; When in siren mode, sounding time is adjustable from 3 to 30 sec - All components plug into each other. No hard wiring required. 32ft Cable from speaker to sensor - Retro-Reflective Alert System comes with the following: NIR retro-reflective sensor, reflector, Speaker, 9VDC 200mA power adapter. 6ft cable Specifications: - Sensing Range: 22' (7m) - Operating Voltage: Sensor: 9-15 VDC, Chime: 9~15 VDC - Total Current Draw: 100mA Max - Standby Current: 30mA Max - Operating Temperature: -4º~122º F (-20º~50º C) - Speaker Response Time: ~1 sec. for Chime, 30 sec for Alarm - Speaker Volume: Adjustable from 0~max - Alarm Time Range: Adjustable 3~30sec for alarm - Speaker Output: Chime / Off /Alarm (select by switch) - Mounting Brackets: All included - Light Source: IR LED