Our wireless earmuffs made of plush material, duarble and practical. for biking,hiking,skiing,running,hunting and every winter outdoor activities! It keep warm and enjoy music, hand-free call for outdoor activities, the for winter or fall. Features - Color: Grey - Material: plush. - Size: 12 x 10cm. - Made of material for comfort against your ears. - Wireless ear muffs keeps you warm while providing premium -fi sound, microphone, and connecting to your smartphone - Ear headphones feature unique collapsible design for portability. - Minimalist stylish design with discreet power and volume controls. - Great Christmas present 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 , medium volume 10 hours - Microphone distance: 1 meter - standby time: 72H - Battery capacity: 150ma / h - Battery power: 0.55W - Speaker impedance: 32 - 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: 5V - Maximum input : 150mah - Maximum input power: 0.55W Package list: 1 x Earmuff