Product introduction:Built-in Bluetooth Technology Works with Virtually any Bluetooth-Enabled Device (Smartphones， Tablets， PCs)Silicone protective sleeve ensure waterproof and shockproof functionBuilt-in 4000mAH battery， which can last for up to 10 hours on a single charge. This speaker can also be used as a power bankThis is a multifunctional bluetooth speaker which has flashlight， wireless bluetooth music， FM， TF card， power bank functionsFlashlight function1. S1 is a new product. It is a bluetooth speaker as the outdoor riding mate. You can use it to listen music when you are bicycling or have a picnic， camping. It also be used indoor.2. S1 can be as a mobile power bank. It's capacity can charge twice for iPhone.3. S1 has emergency flashlight function. It can be used as a temporary spare flashlight when you suddenly enter a dark environment4. S1 support TF card5. S1 has FM fuction. (FM function will better when it is plug in audio cable)6. S1 is IPX5 waterproof and dustproof skid Technical specification:1. Battery capacity: 4000mAh2. Bluetooth Version: CSR 4.03. Transmission distance: 10m4. Input voltage: 5V/ 1A Output voltage: 5V Output power: 3W Work voltage: 3.7V5. LED lamp power: 1W6. 3 LED modes: Normal， Weak， Flash7. Speaker: 4��8. SNR: ��90dB9. Frequency response: 20Hz - 20KHz10. Distortion: 1%11. Music time: ��5hrs12. Standby time: ��30 days13. Size: 156 x 51 x 51 mm14. Weight: 260gPackage:1 x S1 bluetooth speaker1 x Mountaineering buckle1 x USB charge cable1x Bicycle bracket