Features: 1) Digital LED showing obstacle distance 2) Reports the distance with voice 3) Musical alarm 4) Hands-free kit 5) All kinds of sensor colors and styles are available 6) High quality and easy to install 7) Recording and play functions 8) Mute function for confidential calls Parameters: 1) Voltage: 9 to 15V 2) Range:0.3 to 2.5m 3) Temperature: -30 to 70°C 4) Input: ≤2W Note: model JT408 has 4 sensors, model JT468 has 6 sensors