Imprint Method: 4Cp Transfer, Imprint Method: Spot Color Transfer - Palm sized cylinder wireless speaker with snow canvas accent wrap body and no slip bottom. Power Supply/Technology: Rechargeable Lithium Polymer battery: 3.7V, Capacity: 350 mAh; Input: DC 5V; Output/Power: 3W; Aux in: 3.5 mm audio jack; Rated Impedance: 4 Ohm; Speaker: 1.6"; Frequency response: 90-20KHz; SNR: = 85d; Sensitivity: 80db +/- 2db; Distortion: = 0.3%; Transmission range: 10m (30 ft.); Wireless 4.0. Pair with smartphones to use hands-free microphone feature. Push button to answer calls. May also be powered with 3.5mm jack and audio cable (cable not included). Connects to mobile devices using wireless technology or through the 3.5 mm audio cable (not provided). Also play MP3 files though a USB flash drive or TF card. Instructions included. CE and FCC approved.