306721 Color Black Brand N/A 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 to0m; Shade Of Color Black Sensor Color Black 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 915 V Rated Current 10~300 mA Working Temperature -30'C~+80'C ℃ 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-cable) 2 x Adhesive tapes 1 x English user manual