T2S, Turbine 2 (Shooting Brake), a upgraded version of HT(Shooting Brake). It's been 6 months, our engineers redesign the Turbine idea, trying to bring you the best music experience. Besides the amazing bass as HT(Shooting Brake), T2S is foldable and easy to carry, more comfortable to wear, more metallic in look, and strengthened in headband. Color: black, white, red and blue Specifications: Bluetooth version: V4.1 Bluetooth range: up to 32 ft (free space) Profiles: A2DP, AVRCP, HSP, HFP Drivers: 2xΦ57mm Impedance: 16Ω Frequency response: 20 Hz -20KHz SPL: 110dB THD: <0.1％ Bluetooth music time: about 40 hours Bluetooth talk time: about 45 hours Standby time: about 1625 hours Fully charged time: about 2 hours In the box: Bluedio T2S headphones Charging cable Audio cable User manual Pairing tips: When pairing, you need to make sure the headphones have entered pairing mode: When the headphones are off (If not, turn off the headphones first), press and hold the MF Button(Power Button) until you see the blue light stays on (instead of blinking). About Bluedio is a manufacturer pioneer in portable audio device, providing solutions of professional audio and wireless communication. In 2009, we have registered Bluedio as our trademark in the USA, later obtained certificates from China and the whole world. So far, Bluedio has owned over 30 patents, highly praised by consumers over 34 countries.