Feature: 1. Multi functions display lock battery voltage, altitude, satellite numbers, mileage, trip time. 2. 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. 3. Connect by USB cable, plug and play. head up display will power off when car off. 4. 2 Alarm function: Speed alarm and voltage alarm, improve driving safety. 5. Light sensor: head up display can automatically adjust the brightness according to the environment. 6. 3D Reflection Display: with transparent display board, no need reflection film, very clear in daytime and night, no double image. Specification: 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. head up display will power off when car off. 2 Alarm function: Speed alarm and voltage alarm, improve driving safety. Light sensor: head up display 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: