Bluetooth 5.1 wireless technology can ensure high-quality strong signal transmission and provide high-fidelity stereo music. The product has high-quality speakers and vibration diaphragms, which can provide clean and excellent sound quality. Built-in high-capacity 450mAh rechargeable battery, which can provide about 4 hours of working time. This portable bluetooth speaker is lightweight and compact, allowing you to carry it with you, and suitable for more occasions.<br><br>Item Name: Bluetooth Speaker Bluetooth: V5.1 TF Card: Support Speaker Output: 5W Distortion: less than equal 5 Percent Signal And Noise: 95DB Bluetooth Communication Protocol: A2DP, AVRCP, HFP, HSP Battery: Built-in Battery/450mAh (Included) Charging Voltage: DC 5V Charging Time: About 3 Hours Talk Time: About 5 Hours Play Time: About 5 Hours Features: Portable, Convenient, Pocket-sized, Stereo Bass Player Colour:black Material:aluminum alloy<br><br>Package Contents: 1 x Wireless Bluetooth Radio 1 x USB Cable<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.