Wireless distance : around 15m Supporting agreement : A2DP 1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 Bluetooth frequency band : 2.4 GHZ Battery capacity :both left and right ears have built-in 50mAh special custom rechargeable lithium polymer batteries /charging case battery capacity 500mAh Standy time : one ear can stand by for 100 hours ,both ears can standy by 60 hours. Monaural playback /talk time : around 4-5 hours. Binaural playbak/talk time : around 3-4 hours. Feature : Large screen digital display outside the cabin,keep track of the charging box and the headset power . Additonal function : After the charging case is closed,the built-in " germicidal lamp " starts work .sterilize and clean the ear caps and cabin.sterilize after 20s .the lights stop working.