SECO-LARM E-931CS22RFCQ Wireless Entry Alert System (2 Pack) For Monitoring a Driveway or Use as an Entrance Indicator, Up to 22 Feet Sensing Range, Up to 328 Feet Wireless Transmission Range Sensing range up to 22 feet; Wireless transmission range up to 328 feet; IR LED Light source; 0 to 90 dB Speaker volume Ideal for monitoring a driveway or use as an entrance indicator; No wiring required between the sensor and speaker; when tripped, the sensor wirelessly transmits to any programmed speaker Weatherproof IR photoelectric beam sensor for outdoor use; Speaker makes "ding-dong" or siren sound if beam is interrupted; Speaker volume can be adjusted or turned off When in siren mode, alarm time is adjustable from 3 to 30 seconds; Additional speakers can be connected to the sensor wirelessly (only one speaker included) Kit includes weatherproof wireless reflective sensor (Tx), wireless speaker (Rx), reflector, two power adapters and three mounting brackets (one each for the sensor, reflector, and speaker)