The color of the shipment is random. For large quantities, we will negotiate separately! Built-in wireless microphone, hands-free Bluetooth call support, TF card (up to 64GB) Power supply: high-capacity rechargeable lithium battery. Playback time: 4-8 hours. Bluetooth distance: 10 meters. Rated power: 5W. Impedance: 2.6Ω Frequency Response: 90HZ-18KHZ Distortion: THD<10% Signal-to-noise ratio: S/N≥85DB Lithium battery specification: 3.7V/650MA 1 Product size: 65* 63mm 2. Packaging: 140*110*65mm 3. Outer box size: 60*32.5*23CM 4. Box quantity: 30PCS 5. Weight of one box: 15.1KG 6. Net weight of the product :450g. Colors: Rose gold, Champagne gold, sky blue, deep space Gray, Space silver