Somos DIGITALSTOREC1•Bluetooth Version :V5.3 •Working distance :10•Battery Specification :3.7V 300mAh•Built-in rechargable Lithium battery charging Voltage: DC4.2-5.2V•Charging time : 2 Hours•Talking time :30 hours at default Vol when ANC OFF•25 hours at default Vol when ANC ON•Driver :2x40mm Impedance:32ohm•Spot painting finished•90°rotation ear-muff and foldable ;protein earmuff with high •frequency finished and memory sponge•Active Noise cancelling : -22dbDIGITALSTOREC1