Product Name: Bm2 Portable Bluetooth Mobile USB Speaker Model NO.: BM2 Recording Function: Without Recording Function Extended Storage: SD Card Maximum Expanded Capacity: 16GB Special Function: USB Disk Support, Memory Card Support, Radio Built-in Battery: Built-in Battery Sound Channel: 2.0 Adjusting Method: Touch-Control Usage: Portable Player, Computer, Mobile Phone, Radio Speaker Material: Plastic Amplification Type: Active Trademark: Neutral Transport Package: Gift Box Specification: 55*42*80mm Origin: China Product Description BM2 Portable Bluetooth Mobile USB SpeakerSpecification:Material: aluminum alloyBluetooth Specifications: Bluetooth3.0Transmission distance: 10 metersPower amplifier specifications: 2WBattery specifications: 200MAHPlay time: 1-2HProduct Size: 33.6 x 24.8mmProduct weight: 30gPacking size: 5.7 * 4.2 * 8CMAccessories content: phone lanyard + manual + charging lineEach set of weight: 60g