Color and new or old packaging will be randomly dispatched. For large quantities, please negotiate separately! 1. Product size: 85* 43.5mm 2. Packaging: 140*110*46mm 3. Outer box size: 36*32.5*27.5CM 4. Quantity of boxes packed: 30PCS 5, each box weighs 20.5KG. Built-in wireless microphone, hands-free Bluetooth call, supports TF card (up to 64GB). Power supply: high-capacity rechargeable lithium battery. Playback time: 4-8H. Color: rose gold, champagne gold, sky blue, deep space gray, space silver. 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/750MA