L-288FM Dual Speaker Radio MP3 Player Support TF CardU Disk with LED Display 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