Feature: 1. [Battery Powered] Charging for 5 hour, this wireless laser timer can provide 8 hours of usage time, with battery percentage reminder design, easy to use, no need for connecting to power sources. 2. [High Performance] This racing timer features effective light distance greater than 8m, adopts 5 digit display screen, can accurate to 0.001 seconds in one hour timing. 3. [Automatic Reset] The timer automatically resets and moves into a new timing cycle when triggered, eliminating the need for manual resetting. 4. [Premium Material] Constructed with aluminum, PC and ABS materials, this timer is water resistant, shockproof, compact, and portable for ease of use in various environments. 5. [Versatile Applications] Ideal for timing events with the same start and finish point. Suitable for motorcycle racing, karting single lap timing, pile driving timing, balance scooters, roller skating, pet training, track and field training competitions. Specification: Item Type: Wireless Laser Timer Material: Aluminum, PC, ABS Model: GX5D Track time01 SPQ Timer Power Supply: 1 x Lithium Ion Battery 1500mAh (Built in) Single Turn Back Device Power Supply: 1 x Lithium Ion Battery 1500mAh (Built in) Machine Charging Input Voltage: DC 5V. Package List: 1 x Wireless Laser Timer 2 x Turnback Device 2 x Reflector 5 x Floor Stand 4 x Stand 2 x Charging Cable 3 x Antenna 1 x Storage Box Note: 1. Do not stare at the laser emission hole during work. 2. The product does not come with a power adapter, any DC 5V power adapter can be used to charge the product.