Please note, this item ships from an international seller. Expected delivery is 10-15 days. Features: The device not only displays the maximum / average / action. Speed, as well as distance and time data, can be used to adjust driving or training programs. (The parts should be used in the correct position: the distance between the sensor and the magnet should be within 5mm, and the distance between the sensor and the bicycle computer should be within 60cm.) All these functions can be realized with only 2 buttons. Please fill in the correct wheel circumference before use. #If you need instructions in German, please contact us, we will provide you with PDF instructions in German. Simply press the quot;SETquot; buttons to turn on / off the lighting. Specification: Name: Bicycle wireless speedometer Colour: Black Size: 6 * 4.5 * 2cm Package Included: 1 x Bicycle Speedometer 1 x Bracket set 1 x Wireless sensor 1 x Magnetic safety sensor 1 x Rubber band 2 x Adhesive discs 4 x Fastening strap 1 x User Manual [Speed and distance measurement] [Wireless] The bicycle speedometer is made of high-quality wireless technology [Multifunctional and easy to use] Stopwatch, timer, automatic wake-up, KMH / MPH switch Provide stable wireless transmission and ensure the accuracy of driving data. [Backlight] The green LED can be used at night.