Do you want a bike light? and want a bike computer, too? BIKUUL bike light and bicycle computer in one is your best choice. (Starting from August 8,2020, the product package includes 1* USB Taillight)Specifications: Type: Bicycle LightMaterial: ABS PlasticLight Source: T6 LED LightPower Supply: BatteryColor: BlackFeatures: 1. Large screen display, anti-glare design, power display, a cable code table can be connected, fie changeable modes can be obsered speed, time, speed, whole journey, one-way, etc. 2.120 dB bell design, higher warning greatly improe the safety of night riding and rainy riding. 3. Double switch design, easy to operate, press the bell button to switch whistles, horns, alarms, loud sounds in turn. 4. Stable buckle design, just need to install the bracket, you can quickly install at any time, simple and conenient, rubber base is firmly adhered and not loose, suitable for most handlebars. 5. Good waterproof performance, so that you can work in rain and wind without damaging the working lights so that you can ride safely. How to Set: Step 1: Set the unit - Long press the Set Button - and the Mode Button +, the words km/h, press the Set Button - to change it as m/h or not. Step 2: Set the speed - Press the Mode Button +, at the same time, the number 208" will blink on the display, it means the default wheel size, the unit is CM. You could press the set button - to change the wheel size from 10-315 CM. Step 3: Set the ODO - Press the Mode Button +, press the set button - to adjust ODO. Step 4: Press the Mode Button +. Package Included: 1* LED Bicycle Light1* USB Taillight1* USB Charging Cable1* Speaker Controller1* Code Table Data Receier1* Code Table Data Sensor1* Instruction Manual2* Foam Gasket4* Fixing Strap.