This is a device designed to accurately measure your vehicle's speed and provides audio alerts, ensuring you avoids costly speeding tickets. This car-mounted Speed Tester offers acuurate speed detect, allowing you to stay within legal limits effortlessly. The built-in sound alarm system instantly notifies you if you exceed the speed limit, helping you maintain a safer and responsible driving experience. Features: Built in Chinese, English, and Russian language switching. Real time driving speed measurement, quick measuring speed, and high accuracy. Sound signal strength level indication, special tone provides signal strength and frequency band recognition. Multi mode warning selection, urban area, highway, mute, automatic mute mode switching. Intelligent frequency conversion, strong anti-interference performances. Compact in size, it doesn't affect your driving, and it's easy to install. Specifications: Main color: black Material: ABS Working voltage: 12Volt Speed measuring range: X-band: 10.525GHz ± 100MHz K-band: 24.125GHz ± 175MHz Ka band: 34.700GHz ± 1300MHz, 35.100GHz ± 1300MHz Laser: 904mn ± 33MHz Strelka pulse duration: - 30ns Pulse cycle: - 25us Item size: 103 * 65 * 28mm / 4.1 * 2.6 *1.1in Item weight: 77g / 2.7ounce Package size: 150 * 110 * 45mm / 5.9 * 4.3 * 1.8in Package weight: 188g / 6.6ounce Packing List: 1 * Car Driving Speed Tester