Features 1.WATERPROOF: The Bluetooth speaker has a powerful waterproof function, suitable for outdoor sports and cycling activities (can be used in the rain). 2.SERIAL CONNECTION: This Bluetooth speaker supports serial connection function, which can connect 2 speakers to provide a more powerful sound experience. 3.WIDELY APPLICABLE: Simple appearance design, fashionable and generous, this wireless speaker is suitable for a variety of scenes to use. 4.MULTI FUNCTIONAL: The wireless speaker supports card insertion and radio, you can listen to the radio and favorite music, meet your different needs. 5.COMPATIBLE DEVICES: Built in Bluetooth technology, can wirelessly connect to cell phones, tablets and other Bluetooth devices, easy to carry and use. specificationItem Type: BT Speaker_x000D_ Material: ABS_x000D_ Battery Parameters: Lithium Battery (With Built in Battery Delivery)_x000D_ Battery Model: 503040_x000D_ Battery Capacity: 500mah PackageList1 x_x000D_ _x000D_ BT Speaker 1 x Charging Cable 1 x Connection Cable 1 x Instruction Manual 1 x Fastening Ring NoteShips without Memory Card