Product Description: This speed measurement instrument is mainly used for object acceleration and velocity measurement, individual users can be used to measure the design speed of all kinds of shoot playthings. High accuracy, with accurate measurement data, simple and easy operation. Large LCD display with backlit, you can see the data in the weak light environment clearly. Totally 2 versions available, you can choose according to your demands. Wifi version: with Wifi function; support record 120 groups of data, shutdown will not reset, support manual reset; default traditional Chinese, and support switch to English. Specifications: Name: Speed Measuring Instrument Material: aluminum Battery: 1 * 3.7V, 400mAh lithium battery (included) Version: common version, Wifi version (optional) Shoot speed: 0-3600s/min (0-60s/s) Initial velocity: 2-1500m/s (10-5000ft/s) Kinesthetic energies: 0-999J Shoot ranges: 0-999m Accuracy: error0.5% Host size: 44 * 73 * 33mm / 1.73 * 2.87 * 1.30in Package size: 130 * 80 * 90mm / 5.12 * 3.15 * 3.54in Package weight: 180g / 6.35ounce Packing List: 1 * Speed Measuring Instrument Thank you for your interest and support. We strive to provide practical and reliable products for your daily needs. Please note that due to lighting conditions, photography, and differences between display devices, the product color shown in the images may vary slightly from the actual item. The actual product shall prevail. We appreciate your understanding and wish you a pleasant shopping experience.