1. Detection distance: 0.3~2m (3m) 2. Alarm distance: 0.3~1.5m (2m) 3. Error range: <1cm 4. Range: <0.9m 5. Working frequency: 40KHz 6. Working voltage: 12V DC 7. Current consumption: 20ma-200ma 8. Working temperature: -40°~80° 9. Alarm volume: 70~85dB (at 30cm) 10. Maximum power: 2.5w Host 1. The shell is novel and trendy, made of new ABS material. 2. Dual CPU microcomputer intelligent control, derived from military technology, accurate and reliable. 3. SMD motherboard, beautiful and neat, the failure rate is less than 0.05%. 4. Using imported chips, the speed is faster and more accurate. 5. After-vibration elimination technology to reduce false alarm rate. Probe (size: 22*20mm) 1. 22mm concave design, no water accumulation, unique design to prevent false alarms caused by ultrasonic waves reaching the ground. 2. Ceramic material crystal, longer life. 3. Anti-interference wire, not interfered by the original car signal. 4. Beer head design, more easy to plug, long life. 5. Optional waterproof wire, easy to install. 6. The probe adopts embedded installation, multi-color configuration The sensor is exquisite and compact. Precautions: 1. This product is best installed by professionals. 2. In case of heavy rain, the probe will be dirty, fall off or damaged, which will affect the detection effect. 3. Different objects will have different detection distances. 4. Obstacles below 15cm may not be detected. 5. Obstacles within 30cm from the probe cannot distinguish the distance, the display is 0M, and the alarm beeps for a long time. 6. Obstacles that are too thin may not be detected.