Note: T17 is better than T1C in terms of low latency, clear calling ENC technology and long battery life. It is an upgraded version of T1C.T17 black and T17 white support QCY APP connection, T17 blue part supports QCY APP, part does not support it. Have Fun With No Limits QCY T17 Youth Bud HIFIStunning Sound26hr Ultra-long battery life Ultra-low latencyfor mobile gamingBluetoothV5.1Small earwings Stable wearing4.2g As light as a paperENCNoise-cancellation for callingMaster-slave switch Mono/stereo modeTouch control Easy to useYouth Bud Outstanding Aesthetics Impressing yet minimalist housing features various perfect details, fitting your varied styles. With wings, these cute earbuds stay in place when you don"'"t. 4.2g Super Light Senseless wearing like breathing Based on a survey involving a large number of users, the earbuds fit you snugly. Single earbud, 4.2g only, is like an A4 paper, with senseless wearing experience.* Choose one pair from S, M and L eartips to add to your comfortable wear. Amazing Sound Rock & roll wherever you are With professional tuning and composite diaphragm, the built-in dynamic driver delivers transparent sound and quick transient response. Wearing them, you were in an in-person live concert. AAC HD Audio Codec Well-tuned tri-frequency * Some Android 9.0 phones are within white list setting SBC as default. One of solutions is rooting your phone and adding the Bluetooth address into the list yet its risky. Low Latency Perfect for mobile gaming Activating low latency mode, you can always act before your enemies in virtual world. Bluetooth 5.1 Powerful heart Thanks to the new technology, the Bluetooth 5.1 chip takes you into virtual world with no limits. Ultra-long Battery Life 26 hours of playback One top-up offers 7.5 hours of playback while the charging case extends it to 26 hours. Keep music playing Clear Calling ENC technology Blocking most part of ambient noises, ENC technology enables crystal-clear stereo calling. Stereo or Mono Master-slave switch allows them all With dual-ear information sharing, either earbud can serve as master for fast reconnection and stereo-mono switch. Hi, Siri Assistant stays on call Triple touch left earbud to summon the assistant and tell her your demands. Touch Control Easy to use 1,Double touch for Pause/resume playing2,Double touch for Answer/end call3,Keep touching right/left earbud for 1.5s you can Skip track forward/backward4,Keep touching 1.5s you can Ignore call5,Voice assistant6,Low-latency mode Whats in the Box 1.Earbuds, charging case * 1 2.Eartips * 3 pairs S/M/L(one pair has been assembled) 3.Type-C cable * 1 4.User manual * 1 Parameters Product name: T17 Certified modelBH21Q17A Pairing name: QCY-T17 Bluetooth version: 5.1 Available system: iOS/ Android Operation range: 10m Battery life: 4.5hr of calling; 5.5hr of playback Bluetooth profiles: HFP/A2DP/AVRCP Battery capacity(case): 380mAh Top-ups by case: 2.5(for both earbuds) Charging port: Type-C * For the best compatibility, we recommend you to connect T17 with phone rather than computer.