Feature: 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. Specification: Item Type: BT Speaker Material: ABS Battery Parameters: Lithium Battery (With Built in Battery Delivery) Battery Model: 503040 Battery Capacity: 500mah. Package List: 1 x BT Speaker1 x Charging Cable1 x Connection Cable 1 x Instruction Manual 1 x Fastening Ring Note: Ships without Memory Card