Feature: 1. RACING TIMER: Wireless digital timer, suitable for sprint racing, electric bicycles and motorcycles, skating, track and field timing, etc. 2. FAR DISTANCE: Effective light distance greater than 8 meters, suitable for timing at the same starting and ending points, efficient and practical. 3. 5 DIGIT DISPLAY: This timer adopts 5 digit display, precise timing, no manual reset required, and one hour timing error less than 0.001s. 4. EASY OPERATION: Charging for 5 hours and using for 8 hours, the switch button is on the side of the timer, no need to connect to a mobile power source. 5. COMPLETE PARTS: Including timer, turnback device, and reflectors, with brackets, easy to install and use, waterproof and shockproof, has a long service life. Specification: Item Type: wireless Timer Material: Aluminum, PC, ABS Timer Power Supply: 1500mAh lithium ion battery (built in) Turnback Device Power Supply: 1500mAh lithium ion battery (built in) Machine Charging Input Voltage: DC 5V Power Adapter Input Voltage: 100-240V Package List: 1 x Timer 1 x Turnback Device 2 x Reflector 4 x Floor Stands 3 x Brackets 2 x Charging Cables 2 x Power Adapter (Color Random) 1 x Storage Box 1 x User Manual Note: It is strictly prohibited to observe with your eyes directly facing the emission hole during work,