Features: Multi functions display lock battery voltage, altitude, satellite numbers, mileage, trip time. Use 10 Hz high refresh rate GPS+BDS chip, the refresh rate is 10 times/second, thus the speed is more fast and there is no delay. Connect by USB cable, plug and play. HUD will power off when car off. 2 Alarm function: Speed alarm and voltage alarm, improve driving safety. Light sensor: HUD can automatically adjust the brightness according to the environment. 3D Reflection Display: with transparent display board, no need reflection film, very clear in daytime and night, no double image. Specification: Model: T900 Color: Black Material: ABS Environment temperature: -40 +80 Environment voice:Work voltage: 5V~28Vdc(12Vdc/200mA) Sleep current:Projector image size: 9020mm Display: LED Display Virtual image distance: 55mm Product size: fold: 1356830mm full size: 1356856mm Weight: 331g Packing List: 1x Display 1x Cable 1x non-slip mat 1x User Manual