BT version: 4.2. Key functions: Track control & volume control. Playing modes: BT, USB, micro SD card, Aux & FM radio. Battery: Lithium-Ion 1200 mAh. Charging time (hrs): 3. Playing/standby time (hrs): 2/48. Driver diameter (mm): 100. Output Power (W): 12. Frequency range (Hz): 120 20K. Impedance (Ohm): 4. Sensitivity (dB): 40+. Signal to noise ratio (dB): 70+. Micro USB charging cable included. Dimensions (in): 10.1 x 5.7 x 5.7. Weight (lb): 2.8.