• "Smart" knit beanie with built-in wireless stereo headphone with microphone for listening to music and handsfree phone calls. • Made of Acrylic knit with ABS Plastic buttons and components and rechargeable battery (included). • Hand-wash only. • USB to Micro USB charging cable included. • Features easy-to-use interface and LED indicator lights. Instructions included. • Approx. 6-8 hours of playback time (at 70% volume or lower) • Charge time varies by device and environmental conditions (2 hours minimum). Charge required prior to first use. Device can hold charge for up to a week at a time. • Power/Technology: Input: 5V; Work current: 160 mA; Standby current: 3mA; Transmit power: 95 dB; Sensitivity: 95 dB; Frequency response: 20-20 kHz; Transmission range: 10m (32 feet); Built-in battery type: Lithium battery. Wireless 3.0. • Item works with most wireless enabled devices.