Built-in Compass measure surroundings real time. Ensure safe travel. Made of high quality ABS materials, environmental, durable and safe. There is a holder on the back, you can put it on your dashboard easily. You can have a clear vision and safe driving. A magic sticker on the holder ensure the ball fix on the flat firmly and quickly. Compatible with Auto Boat Vehicles. It easy to carry, suitable for office, travel, field trips outdoor camping hiking. Specification: Type: 3 in1 Guide Ball Material: ABS Item color: Black Function: Compass, Suitable For: Office, travel, field trip etc. Size: 11.6*4.4*3.7cm / 4.5*1.7*1.5"(L*W) Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-3mm measuring deviation due to manual measurement. Package Included:1 x Compass