1. Suitable for off-road motorcycles, karts, ATVs, chainsaws, lawn mowers, etc. 2. The battery is easy to replace and can be used for a long time 3. Replaceable battery, reset button, speed mode setting 4. Hand-held induction, wire clamping induction, easy to use 5. Power supply: 3V 6. Purpose: can measure high speed 7. Power supply: built-in CR2450 button battery 8. Size: 46x57mm