Description: Professional Navigation Compass Ball Floating Dial with sapphire bearing to ensure quick movement and optical precision Fast Response and precision Engineering Wires into your 12V system to provide lighting for evening and night use Built in Accuracy compensators Easy to read precision dial With adhesive tape Waterproof, durable and long lasting Suitable for Boat, Caravan and Truck Specification: Material: Plastic Color: Black Size: 102(L)*94(W)*137(H)mm Voltage: 12V Package Includes: 1 X Navigation Compass Note: ATTENTION: This compass is designed for boat or watercrafts. The reading is totally opposite to normal compass. For example, when you are facing NORTH while the compass is placed in front of you, the reading shows "N" to you and "S" pointing north direction. The reading facing you is the correct direction that you are facing, that is "N"