Features: 1. HiFi Sound Quality.  Features with the most advanced tech, the 1/4" dynamic driver ensures an incredible HiFi sound and endow a premium and fined-tuned music quality for you.  2. Crystal Voice Call.  DSP voice noise reduction technology upgrade noise recognition ability, so that other can only hear your voice clearly no matter how noisy environment you are in.  3. 1-Second Pairing.  Simply open the FIIL earbuds case near your phone to pair effortlessly within 1s. FIIL T1X use Bluetooth 5.0 and LDS tech to improve the stable of the wireless connection. Completely automatic system gives you a hassle-free experience when pairing and connecting to your devices.  4. 24H Playing & 36H Calling with Portable Charging Case.  The ultra-high-capacity of the charging case keeps you free from the anxiety even if you far away from home. FIIL T1X case uses the Type-C charge. It can support 2H playing with only 10 mins charging.     Specifications:   Model:T1X.    Color:Black.    Wearing Type:In-Ear.    With Microphone:Yes.    Bluetooth Version:V5.0.    Supported Profiles:HSP/HFP/A2DP/AVRCP.    Bluetooth Audio Decoding:AAC, SBC.    Transmission Distance:33 feet (10m).    Horn Distortion:< 3% at 1MW.    Horn Sensitivity:95dB SPLat1mw.    Horn Size:6.1mm.    Frequency Response:15Hz-22kHz.    Battery Capacity Earbud: 50mAh.    Charging Box: 500mAh.    Waterproof:IP65.     Package Included: 1* pair of FIIL T1X TWS Earphones.  1* Charging Case.  1* Charging Cable.  3* pairs of Eartips.  1* User Manual