Description:Material: Acrylic Working Voltage: DC3.7V (Built-in Lithium Battery)Operating Ambient Temperature: -10°-+60°Accuracy: Test Error Is Less Than Or Equal To Plus Or Minus 1%Speed Measurement Range: 1-500M/W Energy Measurement Range: 1-800J Input Range 0.1-10G Speed Range: 40 Groups Kinetic Energy Registration: 40 Group External Dimension: 130X50X72mm (Long X Wide X High) Local Features & Simple Operation:1: Four sides air design, effectively mitigate the impact of the airflow test. Improved stability and accuracy. The display surface and operation buttons are located on the front, and it is very convenient to operate and view the test data.2 small size. Length*Width*Height 130 X X 72MM Portable.3 High precision speed. Because the high-precision and clamping rail gun and the fixed equipment along the path are the same every time, and the guide rail can be made in parallel with the mining model, so the measurement result error is small, small fluctuation dynamic error.4 more functional. Not only can it measure speed, but also can measure kinetic energy, and can record up to 40 sets of velocity and kinetic energy values of 40 groups.5 multiple energy management and protection. Lithium battery has the function of over-charging, over-discharging, and short-circuit protection. At the same time, the instrument integrates intelligent shutdown and low shutdown function. The smart shutdown function is enabled by default, you can disable this function6 simple operation. Check the starting speed can be tested without any settings or adjustments! Switch machine: press the button to turn off the on state. Hold the button for more than 3 seconds at screen speed when the OFF, Power off button is displayed. Note:The item color displayed in photos may vary slightly when showing on your computer monitor since monitors are not calibrated same. Please allow 1-3mm slight deviation due to manual measurement. Thank you! Package Included:1*Shooting Speed Tester1*U-shaped Clamp1*USB Cable