Black Office/Call center In-ear Headset Wireless Bluetooth 5.2 30 m 100 - 20000 Hz 32110 dB Microphone type: Built-in -38 dB Built-in battery Lithium-Ion (Li-Ion) 160 mAh INNOVATIVE MULTIFORM PRODUCT PORTFOLIOCHOOSE THE BEST ONE FOR EACH SCENARIONOISE-FREE CALLINGWhen you talk, the world will catch every word.4-MIC BEAMFORMING NOISE CANCELLATIONCancel 90% of Background NoiseWhen you're on the run and making calls, ignore background noise.Yealink BH71 eliminates 90% of background noise from your end of the call by applying 4-Mic array beamforming noise cancellation. So you'll sound crystal clear whether you're traversing busy metropolitan streets or are surrounded by raucous crowds.Wherever you are, you will sound fantastic.Free to Move and TalkFree to continue the conversation away from your mobile phone* with a wireless range of up to 100 meters (100 feet/30m) of Yealink BH71. Easily do your tasks without carrying your devices everywhere and stay connected wirelessly.EASY CARRYINGF