ZEALOT S1 Portable Waterproof Wireless Bluetooth Speakers with Toolless Bracket and Carabiner, Bike Accessory with Mobile Power Bank, Emergency Torchlight, TF Card Music Player (Blue) Built-in bluetooth technology works with any Bluetooth-Enabled device (Smartphones, Tablets, PCs); Silicone protective sleeve ensure waterproof and shockproof function; Built-in 4000mAh battery, which can last for up to 10 hours on a single charge. This speaker can also be used as a power bank; This is a multifunctional bluetooth speaker which has flashlight, wireless bluetooth music player, TF Card, power bank output. Flashlight function, 3 mode for different usage/