Continuous use for 3-4 hours. Maximum output 25 W. 1 year manufacturer **No need to prepare acoustic equipment. Package size: 3.1 x 12.6 x 2.8 inches (80 x 320 x Weight: 400g Material: ABS Set Includes: Main unit, USB cable, A-C, USB C-φ 0.14 inch (3.5 mm) 4-pole stereo mini plug. Detailed Size: Maximum Output: 25 W; Frequency Response: 100 - 18,000 Hz; Charging Method: USB Cable Charging (DC 5 V 1 A); Cable Included: Continuous Usage Time: Approx. 3 - 4 hours (when using maximum volume). Charging Time: Approx. 5 - 6 hours.