Wonstart Wireless Earbuds Bluetooth Earbuds Truly Wireless Earbuds Bluetooth Earphones Bluetooth Headphones Wireless Headphones with Mic Volume Control Charging Case for Running IOS/Android (W302) UK CSR 64110 chip inside this true wireless earbuds.The earbud chip decode noise reduction technology give you crystal clear sounds, providing a comfortable and dynamic listening experience. Weighted 6g ea earbud.you feel comfortable and handy and convenient during the time you with it,such as sports, hiking, jogging, cycling and other activities. When headphone are not in use or out of power, you place them in the case and press the charging button, they will be charged immediately. They are fully charged when the indicator light turns blue. Please put the charging box full of electricity before the first using. Dual Ear Mode, get 2 earphones paired with your devices to enjoy the the clear music ( 2 pairing ways, please kindly take the instructions for reference). Single Ear Mode, get the left one paired according to your own needs. Bluetooth agreement : HFP,HSP ,AVRCP and A2DP SBC,AAC Speaker : 16 / 94.53dB at 1mW / 1KHz 0.126V Dimensions: 15.98*24.6*30.3MM Mic : Built-in MEMS Mic Dimensions: 15.98*24.6*30.3MM Noise Reduction: CVC6.0 Function: calling answer/end/refuse/transfer, call waiting,true wireless,music play/pause, noise reduction