• Aluminum case cylinder wireless speaker with Steel Mesh cover and no-slip bottom • Power/Technology: Rechargeable Lithium Polymer battery: 3.7V, Capacity: 350 mAh; Input: DC 5V; Output/Power: 3W; Aux in: 3.5mm audio jack; Rated Impedance: 4 Ohm; Speaker: 1.6 inches; Frequency response: 90-20KHz; SNR: = 85d; Sensitivity: 80db ± 2db; Distortion: = 0.3%; Transmission range: 10M (30 feet); Wireless 4.0. • Connects to your mobile device using wireless technology or through the 3.5mm audio cable (not provided) • Push button to answer phone calls. Speak hands-free into built-in microphone • Playback time: approx. 2-4 hours. • Also play MP3 files though a USB flash drive or TF card • Includes instructions and charging cable. • CE and FCC Approved