Wireless Noise-Cancelling...

Frequency Response Range: 20-20000 HzActive Noise-Cancellation: YesBuilt-in Microphone: YesBattery Capacity: 55 mAh

Bluetooth 5.1 technology ensures higher data transfer speed, stable and fast connection, and low power consumptionTrue wireless dual-ear design, left and right earphone channels are separated. It can be used solely or used in pairsTouch control design, no more physical buttons, no more pressure on your ears Easy to control music and calls, and activate voice assistantBuilt-in Mic on both earbuds with intelligent noise reduction delivers clearer and more real talking sound in stereo modeA 250mAh charging case can charge and store the earbuds 30mAh battery in each headphone ensures 5 hours of music playing time

BT 5.0 technology ensures higher data transfer speed, more stable and fast connection, and lower power consumptionTrue wireless dual-ear design, left and right earphone channels are separatedTouch control design, no more pressure on your ears. Easy to control music and calls, and activate voice assistantBuilt-in mic on both earbuds with intelligent noise reduction delivers clearer talking sound in stereo mode40mAh battery in each earbud ensures about 3 hours of music time

Driver sensitivity range is about 1kHz/1mW (dB) with impedance 14 ohmsDynamic frequency response range is about 20Hz?20 kHzWith up to 25 hours 5 hours from the earbuds and 15 hours from the case of battery lifeBluetooth frequency range is up to 2.4-2.4835 GHzTransmitted modulations are GFSK, ?/4 DQPSK, 8DPSK and 55mAh 3.7V battery