VISLONE LED Bike Light USB Rear Bicycle Light Rechargeable Bike Tail Light and Front Light Set Cycle Headlight with Bicycle Speedometer Odometer Fits All Mountain and Road Bike

Specifications: Color:Blue,Black Material & Process: ABS, lightweight Waterproof level: IP65 Speaker: 120 dB Brightness: 350 lumens Charging method: USB charging Battery life: 3-5 hours Gear: Strong-Weak-Flash-Flood Battery: Built-in lithium battery Product size: 10.5*4.1cm Weight: 100g The Steps for Setting Up The Speedometer? Step 1: Set the unit --- Long press the Button "+" and "-“ together, then press the Button "-" to transform between km/h and m/h. Step 2: Set the speedometer --- Press the Button"+", then the number "208" blinks on the display, it means the default wheel size (the circumference of just one wheel), the unit is CM. You could press the button"-" to change the wheel size from 10-315 cm. Step 3: Set the odometer --- Press the Button"+", then press the button"-" to adjust odometer. Step 4: Press the Button"+". Done. Packing List:     1 * Bike front light     1 * Bike tail light     2 * Silicone mounting strap     1 * Code table data receiver     1 * Data sensor of the code table     1 * Speaker controller     1 * User manual