1. Bluetooth 2.1 technology enables lower power consumption but more stable connection and faster transfer speed (Bluetooth version only) 2. LED display 3. 800 mAh removable rechargeable Li-ion battery 4. Play music directly from TF card, USB and 3.5mm audio devices 5. Built-in microphone to answer hands-free calls 6. Compatible with timer shutdown function, you can choose 15-30-60-90-120-240 minutes according to personal needs parameter: 1. Charging time: 3-5 hours 2. Signal-to-noise ratio: greater than or equal to 87dB 3. Less than or equal to 1% 4. Frequency response: 120Hz-20kHz 5. Output power: 3 W x 2 6. FM frequency: 87.5- 108 MHz 7. Channel: 2.0 8. Standby time: 20 hours 9. Speaker unit: MM 40mm 16 core 10. TF card expansion: 32G max (not included) 11. Dimensions: 179 x 66 x 28 mm