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 SpeakerMaterial: ABSBattery Parameters: Lithium Battery (With Built in Battery Delivery)Battery Model: 503040Battery Capacity: 500mah.Package List:1 xBT Speaker1 x Charging Cable1 x Connection Cable 1 x Instruction Manual 1 x Fastening RingNote:Ships without Memory Card