S1 Wireless Bluetooth Speaker 3 in 1 Waterproof Outdoor Bicycle Flashlight Power Bank Soundbar with TF Card Slot for Phone Music Built-in Bluetooth Technology Works with Virtually any Bluetooth-Enabled Device (Smartphones, Tablets, PCs) Silicone protective sleeve ensure waterproof, dustproof 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, FM, TF card, power bank functions S1 is IPX5 waterproof and dustproof skid