Features: brand new and high quality Bluetooth-compatible provides instant pairing and stable transmission without interruptions. Using upgraded dynamic coil speakers to enhance the sense of depth, presence and space, and present a three-dimensional surround effect like a live scene. USB powered desktop PC speakers equipped with a durable built-in 1500 mAh rechargeable battery. Upgrade anti-magnetic technology to avoid current noise. Compact size design and powered by rechargeable battery make it portable for travel and party. Specifications: Material:ABS Color:Black Bluetooth-compatible Version: 4.0 Operating Range: Up to 33 feet (10 meters accessibility) Charging Port:USB Frequency Range:100HZ-20KHZ Battery:1500mAh Impedance:4 Music Time:About 4-7 hours Music Format:MP3,WMA,Wav Signal Shielding: 87dB IC solution:AB5365B 5.0 Charging Power Supply:DV-5V 500mA Support TF Card Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xBluetooth-compatible Speaker 1x Audio Cable 1x User Manual