Portable Aluminum cube-shaped wireless speaker with 2 operating modes: wireless and AUX/wired (refer to instructions) and works with most wireless-enabled devices including smartphones and tablets. Power/Technology: Rechargeable Lithium-Ion battery – 3.7V; Capacity: 400 mAh; Input: DC 5V; Output Power: 3W; Aux in: 3.5mm audio jack; Frequency Response: 50-20KHz; Speaker Impedance: 4 Ohm (?); Wireless V2.1+EDR; Transmission range: 10M (32 feet). Features multiple functions buttons on base of device including play, pause, stop and volume. Approx. 3-5 hours of playback time. Must be charged prior to first use. Charge time varies by device and environment (2 hours minimum required). LED indicator light (on bottom) shines red when charging. Includes instructions, wrist strap, USB to Micro USB charging cable, and 3.5mm to USB line-in cable.