Qualcomm True Wireless Stereo Plus Technology cVc™ audio technology Bluetooth 5.2 Bluetooth Chipset: Qualcomm QCC3040 Audio Decode: APTX , SBC Microphone: 2pcs/pc, 4pcs/pair Speaker:φ6mm dynamic x 1 Battery(earbuds): 50mAH Battery(charging case): 500mAH Playtime(50% volume): 7hours Dual/Single Modes: Yes Charging time:≤ 2 hours Working range: 10m(android),15m(ios) Frequency response range: 20Hz-10KHz Dual /Single Mode: Yes BT Profile: HSP,HFP, A2DP,AVRCP BT Codecs:SBC/AAC/aptX/aptX adaptive Accessories: Manual,3 pairs silicone eartips(S,M,L),Type C cable