ZEALOT S1 Portable Waterproof Wireless Bluetooth Speaker with Toolless Bracket and Carabiner, Bike Accessory with Mobile Power Bank, Emergency Torchlight, TF Card Music Player (Red) Easily Plays music with bass effect via bluetooth, Micro SD card (TF card) or FM radio; Built-in 4000mAh battery, can output power to external devices via USB port as a powerbank; 3 mode flashlight: high,low,strobe; Strobe mode can be used as warning or SOS in outdoor activities; It can be easily mounted on the bike by bracket and Silicone protective sleeve ensure waterproof and shockproof; The latest bluetooth 4.0 technology works with virtually any bluetooth-enabled device (smartphones, tablets, PCs);