295297 Color Black + Silver Model XY-5301 Quantity 1 Piece Material Plastic Function 1. Numeral and color LED display; 2. Alarm by three-step Bibi sound; 3. Left and right obstacle indication; 4. Numeral display from 2.0m to 0m; Sensor Color Silver Sensor Qty. 4 Sensor Diameter 2.2 cm Detecting Distance 0~2 m Screen Size 1.1" Monitor Type LED Water-proof Others，NO Power Supply N/A Warning Distance 0~2 m Error Range 1 cm Alarm Volume 65 dB Ultrasonic Frequency 1.6~2.0m: whisht; 1.1~1.5m: 1 Hz (slowness); 0.6~1.0m: 3 Hz (commonly); 0~0.4m 7Hz (hurry). Hz Working Voltage DC 9~15 V Rated Current 10~300 mA Working Temperature -30~+80 ℃ Packing List 4 x Sensors (245cm-cable) 1 x Display (580cm-cable) 1 x Main box 1 x 22mm Hole saw 1 x Power cable (100cm) 2 x Adhesive tapes 1 x English user manual