TP-818 Features: 1.Digital display indicating distance between car and obstacles. 2.2-side, 3-color digital indicator 3.3-stage beeping mode indicating different distance 4.voice reminder((optional) Technical Data: Voltage: 12V Working Voltage Range: 10.5V ~ 16V DC Current; 50mA ~ 180mA Range of Detection: 0.2 ~ 1.5 m Temperature for CPC: -40 ~ +80oC Temperature for Display: -30 ~ +70oC