NoiseHush BT700-12266 Freedom Bluetooth Headphones with Mic - White Bluetooth Version: CSR V2.1 + EDR, Transmission Power: Class 2, Frequency: 20Hz-20kHz, Speaker Driver: 40mm Impedance: 32O 15%, Input Power: 50mW Max, Sensitivity: 104 3db, Battery Type: Li-Polymer, Charging Time: 2.5 hours, Music Time: 20 hours, Talk Time: 20 hours, Standby Time: 300 hours Soft-cushion Ear Cups & Headband for Ultra Comfort, Noise-isolating Over-the-ear Design, Adjustable Steel Frame for a Perfect Fit 40mm Neodymium Driver for Extreme Clarity & Precise Bass, Microphone Provides Hands-free Calling & Video Chat Options LED Indicator Displays Connection & Charge Info, Multifunction Button Controls Power, Music & Calls, Package Contents: Headphones, USB Charging Cable, User Manual