The product is based on the color or size of the main image of the product page. BEST OUTDOOR SPEAKERS: S1 mounting on the handlebars of your bike, maintaining bluetooth connection, music playback and hands-free phone calls accompany you along the way; By pressing the power button, S1 turns into a portable flashlight (3 SOS lighting modes) to light your way; Supporting TF card music playback, S1 never let you feel lonely on the go. STUNNING AND LOUD SOUND: Built-in large 40mm driver, neodymium stereo amplifier gives you live experience of talking on the phone and surprising scale, excellent sound resolution gives beautiful S1 tone well above average . With the latest Bluetooth CSR, the S1 offers better bass response and passive subwoofer performance. LONG BATTERY LIFE: 4000mAh rechargeable battery provides long usage time (up to 24 hours per set of TF card) and also makes it backup power, wireless speakers Wearable wire perfect for biking, travel, beach, cycling, horseback riding and other outdoor activities. FULLY EQUIPPED OUTDOOR ACCESSORIES: ZEALOT offers considerably everything you need when cycling with S2 - Bike mount and carabiner and audio cable and USB charging cable and protective silicone sleeve to ensure waterproofing ( small sheet resistant to rain), dust and shock. TIPS AND WARNING: USB port is provided for back-up power, to charge your phone or other devices, DO NOT insert the U disk into the speaker.