Edifier TWS NB NB True Wireless Active Noise Canceling Earbuds, ANC in-Ear Headphones with Button Control, 33-Hour Battery Life, Grey BLUETOOTH VERSION Qualcomm 5.0 BLUETOOTH PROFILE A2DP, AVRCP, HFP, HSP EFFECTIVE DISTANCE 33 feet (10m) PLAYBACK TIME ANC ON: Approx. 5 hours (earbuds) +10 hours (charging case) ANC OFF: Approx. 11 hours (earbuds) +22 hours (charging case) CHARGING TIME approx. 1 hour (earbuds) INPUT DC 5V 60mA (earbuds) / DC 5V 500mA (charging case) FREQUENCY RESPONSE 20Hz-20KHz IMPEDANCE 32?®