1. Buzzer parking sensor 2.Voice and non-voice process available 3.Number of sensor:2-4 sensors All kinds of sensor colors and styles are ... available;2,4,6,8 sensors optional ... 10.5V~16V DCRated current: 50mA~180MaDetecting distance: 0.3~2.0mUltrasonic frequency: 40KHzWorking temperature:-30~+70deg.C Car parking ...