1)most classical led display design, 2) double cpu design 3)three colors, seven segments led display 4)there is switch on the display which is used to turn on or off built-in buzzer sound. Specifications: Led display size: 11 x 2.5x 2cm Control box size: 8.8x 7.2 x 2.47cm Rate voltage: 12v dc Operating voltage range: 9v - 16v Rate current: 20ma - 180ma Ultrasonic frequency: 40khz Detecting distance: 0.3- 2.0m Alarm sound: 75db Working temperature: -40 - 8 Package content: 1 x main control box 1 x led display indicator 4 x parking sensors 1 x saw drill head 1 x power cable 2 x double side sticker 1 x user manual Sets/ctn:20 sets G.W.:12kgs N.W.:11kgs