Bluetooth Active Noise Cancelling Headphones On Ear, Hi-Fi Stereo Headset, Foldable Wired/Wireless, Soft Memory-Protein Earmuffs, Built-in Mic 699d Wireless ANC Headphones for Travel Work TV Phones/PC

Technical indicators: Category: Wireless ANC headphones Wireless Version: V4.1 Modulation method: GFSK, ? / 4 DQPSK, 8 DPSK Support BT protocol:HFP v1.6 HSP V1.2,A2DP V1.6,AVRCP V1.4 DI V1.3 Wireless transmission range: > 10 m Transmission power: support CLASS1 CLASS2 / adjustable CLASS3 maximum 8 DBM Frequency range: 2.4 GHz to 2.480GHz Working voltage: 3.7V Maximum output power: 90MW Noise level :18-20db Signal to noise ratio (SNR): ? 90db Power supply: 280mA lithium battery Rated operating time:?12h Noise reduction modes: dual-microphone noise feedback Speaker diameter: ?40mm Speaker Impedance: 32? Speaker frequency response: 20Hz - 20KHz Speaker sensitivity: 115dB Noise level: ?-78dBA the dynamic range: ? 78 dBA Distortion THD: ? 0.1% Stereo crosstalk: ? -52 dBA Wire length: pvc wire, 1.2m Packing Content 1xBluetooth Noise Cancelling Headphone 1x 3.5mm Audio Cable 1x Mirco USB Charging Cable 1x Airplane Adapter 1x Packing Bag 1x User Manual Warranty Our 699d product includes a 45-day money back & 12 month warranty