Bicycle Parts STABLE, SECURE AND DETACHABLE BIKE PHONE MOUNT: The patented clamping mechanism ensures maximum mobile phone stability. The mobile phone will stay firmly in place even under intense or extreme cycling. Width adjustable features allow for the attachment of mobiles of 3.5 to 7 inch wide. MUSIC OF EXCEPTIONAL CLARITY ON THE GO: The UPPEL Bike Sound System has a 5W Bluetooth speaker equipped with a soft diaphragm that provides high-quality sound of exceptional clarity. The bike speaker bluetooth supports a variety of music inputs including TF card, U-DISK, AUX in, etc. Easily control the device using multi-functional keys. HOURS OF BUILT-IN BATTERY USE: The UPPEL phone bike holder has a built-in 5000mAh battery. Connect the charging cable with the speaker in the power-ON state and use the USB port to charge your cell phone on the go. Continue to enjoy all functions of the system as your phone charges. With this system, you're always connected. The battery can support 6-7 hrs of continuous light and 12-15 hrs of continuous music. If you're using both lights and music, you can expect 4~5 hrs of continuous use. ILLUMINATE THE ROAD AHEAD WITH THE DOUBLE LED LIGHT: The UPPEL bicycle phone mount has an LED light and flashlight function so you can effectively signal your presence and illuminate the road for up to 50m ahead. Hold the Light Key to turn it ON, or have it flashing, and hold it down again to turn it OFF. To change the light range, rotate the base on the handlebar. BICYCLE BELL/HORN FOR SAFETY: UPPEL's Micro B socket can connect to the external bicycle horn cable to activate the bicycle phone holder's ring bell function. The powerful horn sends potentially life-saving warnings to others on the road. The bell has three ringtones and adjustable ring volume. It fits most mountain, road and casual bikes. This is a vital safety feature.