Features: This tachymeter adopts advanced technology and good quality materials, the deviation is less than 0.35%, very precise to use. With a mini display that offers you quick glimpse of data, easy to adjust the setting and operate for measuring lots of objects like BB, steel balls, etc. Supports bluetooth link, suitable for iOS and for Android system, you can get all data you need on your smart phone. Compact size and light weight are good for easy carrying and storage. Built-in battery offers long wokring time, suitable for outdoor use. Supports many mainstream languages, you don't need to worry whether it would be not understandable to you. Specification: Material: Plastic Color: Black Battery: 400mAh Bluetooth: 2.0 OS: fit for iOS & for Android Language: Simplified Chinese, traditional Chinese, English, German, Italian, Japanese, Russian, Polish Size: Approx. 13*11*6cm / 5.12*4.33*2.36inch Weight: Approx. 520g Package List: 1 x Speed Tester 1 x Cable 1 x Tripod 1 x Manual Phone is not included. Note:. The product is suitable for testing toy guns, electric guns, and the range of shooting speed test: 0-120 rounds/second. The highest speed that can be tested is 999m/s.