Package:1 x X3 5.5" Car ELM327 Bluetooth HUD Head Up Display1 x OBD Cable1 x Reflecting Film1 x Anti-slip Pad1 x User Manual The main technical parameters :1�� Conditions of Use Ambient temperature: -40 �� C- + 80 �� C， Environmental Noise: ��60dB (A);2�� Alarm sound level ��30dB (A)3�� Working voltage: 9V ~ 16VDC (12Vdc / 400mA)4�� Size: 155x93x15.7 (mm)， Gross Weight: 480g， Net weight: 80g5�� The main electronic components are used in compliance with ROHS standard6�� Meet CCC standardThe main specific functions are as follows.1�� Detecting car��s OBDII interface automatically and all car with OBD II or EUOBD are OK， plug and play;2�� Car speed， engine speed， water temperature， voltage / throttle position / Ignition angle / one-hundred-kilometer acceleration time， instant fuel consumption， average fuel consumption， mileage， fuelshortage reminding， engine malfunction， shift reminding， compass (only TD-6， TD-6V) etc. are displayed;3�� Normal display mode， high-speed display mode and automatic display mode are set by yourself;4�� Kilometers and miles are free to switch， which greatly facilitates the dashboard of British Standard;5�� 6 inches display area， easy to read6�� Switch on and off automatically， HUD start when car starting ， HUD shutdown when the engine is turning off to protect the car battery effectively; At the same time， you can switch on and off HUD byManually Shutdown to protect the battery safety.7�� Single-stage and four-stage overspeed alarm for driving safely.8�� Engine speed alarming so that you can shift timely to save fuel， also has a special significancefor the novice;9�� Automatic and manual brightness adjustment mode， no dazzling;10�� Compass (only for TD-6， TD-6V)， the precise position， car does not get lost; Accurately determining the position and not get lost11�� Voice Broadcast (only for TD-5V， TD-6V)， simple and direct， reducing eye fatigue.Remarks: tips of sticking the reflective film A. Firstly spray some water on the position of sticking the reflective film; B. Remove the protective layer of the film， then attach to the correspondingposition; C. Adjust the location， then use a small scraper or a smooth object to scrape the surfaceof the film; D. After a few minutes， the moisture will evaporate， then gently wipe off the water droplets and dust.HUD setting methodThe value HUD displays is the value of car inside computer system. Since the value that the car dashboard displays is a little bit different from the value of car inside computer system ， so you can enter the setup mode to fine-tune the display value of HUD to achieve exactly the same values that the dashboard displays.