Features:1. Digital compass， accurate display heading direction and angle. Angle number range: 0~360°. Accuracy is +/-8° .2. Time & Day， Calendar display function3. Car In/outdoor duel temperature display4. Blue backlight with auto cigarette plug Any +/-8Kv electrostatic and strong magnetic field environment will cause malfunctions. You must reload the batteries to reset it. And time\date\alarm need to be set again.Normal Operation1. In normal time mode， press UP to shift temperature between Celsius & Fahrenheit.2. In normal time mode， press SET to display existing alarm time.Time Setting1. In normal time mode， press SET and hold for 3 second into Time/calendar setting mode. Press SET to setting items by below sequence: 12/24 hour format→Hour→Minute→Second (zero cleaning)→Year→Month→Date(Day change automatically) 2. Press UP or Down to adjust desired value3. Year setting range: 2013~2048.4. During setting， Day will change itself automatically.Alarm Setting1. In normal time mode， press SET to display existing alarm time.2. Keep pressing SET for 3 second into alarm time setting. 3. Press COMPASS to set alarm ON/OFF(With icon means ON)4. Press 12/24 to adjust value. 5. Press SET to confirm existing settingA: Alarm sound will keep 1 minute when reach alarm time.B: During alarm sound， press any button for stop alarm sound.CompassThis product is an electronic compass to receive the geomagnetic field. In actual use will be limited by some environmental conditions. In order to ensure the reliability of the reception of the geomagnetic field， please note the following matters when in use:1. The compass reading is easy interfered by magnetic sources .In view of displaying correct angle and orientation， keep the compass in horizontal line.2. Keep this compass away from magnetic sources like mobile， speaker， motor， monitor and other metal objects. Pacakge Includes:1 x Compass1 x Connecting Cable1 x Charger1 x User Manual