Model: DYW-L041 - Quantity: 1 - Detecting Distance: 0.3~2.5 meters - Error Range: - Optimal Range: - Sensor Color: Red - Sensor Qty.: 4 - Sensor Diameter: 2.2 x 2.0cm - Monitor Type: LED - Monitor Size: 0.6" - Working Voltage: DC 12V - Rated Current: 20~200mA - Maximum power: 2.5W - Ultrasonic Frequency: 20KHz~40KHz - Alarm Volume: 70~85dB - Working Temperature: -40'C~+80'C - Help to prevent dangerous and costly collisions; Help to provide increased safety for passengers pedestrians and family members who happen to be around the moving vehicle; Detect small children and low walls as well - Packing List: 1 x Main control box 1 x Power cable (75cm) 1 x LED Monitor (590cm-cable) 4 x Sensors (245cm-cable) 2 x Double side stickers 1 x Sensor drill