Item Type: Head Up DisplayMaterial: ABS+PCSize: Approx. 10 x 3cm/3.9 x 1.2inPower Supply: DC5VBattery: 400mAhSolar Charging: 100mAhAltitude Error: 1-80MWorking Temperature: -40-+80Fitment: UniversalBattery Model: 503030Battery Type: Lithium Battery(Built-In)Battery Capacity: 400mAhNormal Mode:1. Short press the left button to turn on2. Long press of the SET key for 5S to enter the setting mode, short press is invalid.3. Short press the right button to switch soundSet Mode:1. Short press the left button to add2. Short press SET key to switch settings (long press 5s to save and enter normal mode)3. Short press the right button to decreaseMain Function1. Vehicle Speed Display2. Time Display3. Solar Charging4. In-Car Temperature Display5. Altitude DisplayAlarm Prompt Function1. Overspeed Alarm2. Hourly Reminder Function/ Half-Hour Reminder Function3. Fatigue Driving AlarmHow to Use:1. Please place the machine in the unobstructed position of the center console in the car to ensure normal lighting for solar charging.2. After selecting the position, put the anti-skid pad on the selected position and put the machine on the anti-skid pad.