Features: Our wireless earmuffs made of plush material, duarble and practical. Good choice for biking,hiking,skiing,running,hunting and every winter outdoor activities It keep warm and enjoy music, hand-free call for outdoor activities, the best choice for winter or fall. Features - Color: Black- Material: plush.- Size: 12 x 12 x 10cm.- Made of material for ultimate comfort against your ears.- Wireless ear muffs keeps you warm while providing premium hi-fi sound, microphone, and connecting to your smartphone- Ear muff headphones feature unique collapsible design for ultimate portability.- Minimalist stylish design with discreet power and volume controls.- Great Christmas Gift for winter and holiday months to keep your loved ones warm, stylish, and entertained. Prameter - Wireless transmission distance: 10 meters- Headphone channel: Stereo (2.0)- Music playback time: maximum sound 7H, medium volume 10 hours- Microphone distance: 1 meter- standby time: 72H- Battery capacity: 150ma / h- Battery power: 0.55W- Speaker impedance: 32 ohms- Speaker power: 0.02W- Frequency range: 2.4-2.4835GHz- Sensitivity: 45db- Transmit power: 6dB- Audio output distortion: 0.6%- Audio output signal to noise ratio: 93dB- Charging time: 1-2 hours- Maximum input voltage: DC 5V- Maximum input current: 150mah- Maximum input power: 0.55WPacking list: 1 x Earmuff