light-weight design. Double main and subsidiary earbuds design, 360-degree stereo sound effect, innovative and excellent. Bluetooth 4.2 technology, better sound quality. With TWS CSR63120 chip for Hi-Fi calls and stable connecting. Adopt True Wireless Technology; enjoy music without any tangled wires. CVC noise cancellation technology reduces the noise and keeps the original sound. Intelligent 400mAh charging box provides fast charge for your earphone Multi-functional button, achieved by one click. Strong compatibility, compatible with devices as long as they are Bluetooth enables.