Features:Bike computer set, include a 350 lumens front Bike Light with Speedometer, and 120 DB Bike Bell & Red Tail Light, which enables bicycle Tracking, Lighting and Bell, One set can meet all your cycling needs.This water-resistant bike light and bicycle speedometer comes with the USB rechargeable function front bike light, all you need is a USB cord and a power source to recharge (Computer, laptop or a cellphone charger), the 1500mAh lithium-ion internal battery can be charged hundreds of times, making them an inexpensive and environmentally sound alternative to disposable batteries.Bike odometer computer has 5 modes to switch--ODO, DST, MXS, AVS, TM. Precise measurement adjustable for viewing total distance, maximum speed, average speed, cycling time and one way record, suitable for outdoor cycling trip and bicycle training.Bright Screen Green Backlight LCD display with digits ensures easy reading. During day and night, gently touch on the MODE or SET to wake up the backlight screen.This bicycle light can be used as a regular flashlight for hiking, camping, walking, home or office power failure emergency flashlight, nighttime family/kids activities, etc. Road bicycles, mountain bikes, folding bikes, and other common bicycles are compatible with this bicycle speedometer.Specifications:Color:BlueMaterial & Process: ABS, lightweightWaterproof level: IP65Speaker: 120 dBBrightness: 350 lumensCharging method: USB chargingBattery life: 3-5 hoursGear: Strong-Weak-Flash-FloodBattery: Built-in lithium batteryProduct size: 10.5*4.1cmWeight: 100gThe Steps for Setting Up The SpeedometerStep 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 light1 * Bike tail light2 * Silicone mounting strap1 * Code table data receiver1 * Data sensor of the code table1 * Speaker controller1 * User manual