Advanced Bluetooth 4.2 technology for better signal quality Built-in mic, enables handsfree calling Multi-function button for music listening, phone calling etc. Come with mini and portable charging case to supply extended battery life Wireless connect range up to 10 meters Supports TWS (True Wireless Stereo) Can connect 2 Bluetooth enabled devices at the same time Bluetooth earphone battery status display on IOS device Mini earpiece, wire free and easy to carry Chipeset: CSR64110V4.2 Bluetooth Working range :10m Battery Specification: 55mAh Charging box 350mAh Talking time: 4H Standby time: 55H Music time:about 3H Charging time :about 2H Switch muisc: YES Bluetooth version:4.0 Profile:HFP,HSP,A2DP,AVRCP Frequency range : 2.4GHZ IOS Power display:YES 2 Device connect:YES Noise Reduction: CVC 6.0 Audio decoding: SBC Charging input voltage: dc5+0.25V Adjustment mode:GFSK,TT/4 DQPSK,8DPSK Compatible with: iPhone X/8/8 Plus Samsung Galaxy S9/S9 Plus Other iPhone Samsung Huawei LG etc. Bluetooth-enabled devices Brand FineBlue SKU 100360045_NP-1020636328 connector_1 3.5MM Bluetooth Yes wireless_connectivity bluetooth Model TWS-R9