Bluetooth 5.0 technology provides lower energy consumption, a more stable connection, and faster transmission speed. Wireless design allows easy pairing with any Bluetooth-enabled smart device. LED display screen shows speaker working status. Built-in 2200mAh rechargeable lithium-ion battery offers extended playback time. Simple setup and operationconnect your Bluetooth and start playing music quickly. Play audio directly from TF card, USB drive, or 3.5mm audio devices for added convenience. Integrated microphone enables hands-free calling. Supports FM auto-scan function. Bluetooth Version: 5.0+ Battery: Built-in lithium battery 2000mAh-4000mAh Frequency Response: 100Hz-20kHz Charging Voltage: USB 5V 500-1000mA Distortion: Less than 1% SNR: 70dB Speaker: 40mm 4 3W AUX Input: 3.5mm FM Radio Range: 87-108MHz Color: Black Material: Metal Functions: Bluetooth connectivity, hands-free calling, AUX input, TF card/USB playback, FM radio Compatibility: Works with smartphones, tablets, PCs, and other Bluetooth-enabled devices Package Contents: 1 x Bluetooth Speaker 1 x Charging Cable Note: Light reflection and differences in display screens may cause slight variations between the product color shown in the image and the actual item. Measurement error allowed within +/- 1-3 cm.