Product Dimensions:3.66 x 3.43 x 1.85 inches Item Weight:8 ounces Batteries:1 Lithium Ion batteries required. (included) Input Voltage:5 Volts Speakers Maximum Output Power:5 Watts Item Weight:8.04 Ounces Battery Capacity:800 Milliamp Hours Number Of Items:1 [ POWERFUL PORTABLE SPEAKER ]: This mini bluetooth speaker with shockproof and IP65 waterproof is ideal for riding, camping, shower and other indoor or outdoor activities. The built-in mic provides hands-free phone function, which can release your hands to do other things. Loud and clear sound makes you enjoy your music and full of energy. [ BATTERY and SPEED DISPLAY ]: bicycle bluetooth speaker adds small screen display, showing you the remaining battery power, time or your speed. Its convenient for outdoor riders to master riding rhythm and know the current power and time clearly. [ BLUETOOTH V5.0 ]: Fast and stable wireless connection. You can connect your device to the speaker within 10m. If your device has no bluetooth, you can also play music by inserting a TF card or connecting it with an AUX line. [ HIGH-CAPACITY BATTERY ]: Don't worry about running out of power during outdoor sports . This bicycle speaker can be used for 8-12 hours after being fully charged. Just take it with you and enjoy the wonderful music! [ SURVICE GUARANTEE ]: If you have any other questions about bluetooth speaker for bike, please feel free to contact customer service team, we will resolve the issue for you within 24 hours. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.