【Product Features】 ◆ Stable Connection with Bluetooth 5.4 The latest standard significantly improves communication speed, connection stability, and power-saving performance. ◆ Bone Conduction Method That Doesn't Block the Ears Designed to reduce sound leakage and transmit sound without going through the eardrum, ensuring safety by allowing you to hear ambient sounds. ◆ Comfortable & Secure Fit & Waterproof Lightweight yet securely holds. It won't slip even during intense movements like jogging or weight training, allowing for safe use. IPX7 waterproof design. ◆ Large-Capacity Battery Case Built-in 2200mAh large-capacity battery. Up to approximately 5 hours of use with the earphones alone, and a total of approximately 120 hours with the case. Furthermore, it also has a smartphone charging function. ◆ One-Touch Easy Operation Music playback and call answering are possible with one hand. Volume adjustment and track skipping are also easy. ◆ Automatic Pairing Function Once paired, it automatically connects the next time you open the case. No need for connection operations each time, saving you the hassle. 【How to Use】 ◆ Language Setting Tap the earphones twice during pairing search to switch between Chinese and English. ◆ Pairing Method ・Take the earphones out of the case. ・Select "S19" on your smartphone while the earphones are flashing (searching for pairing). ※ Unless you delete the registration, the earphones will automatically connect when you take them out of the case. ◆ Smart Touch Function ・Play/Pause …Tap once during playback → Stop → Tap once → Play ・Skip Tracks …Tap the right earphone twice to skip to the next song. Tap the left earphone twice to go to the previous song. ・Volume Adjustment …Tap the right earphone three times to increase the volume. Tap the left earphone three times to decrease the volume. ・Answer Calls …Tap once when receiving a call. ・Reject Calls …Tap twice when receiving a call. ・Activate Voice Assistant …Press and hold for 1.5 seconds when only connected. 【Set Contents】 ・Bone Conduction Wireless Earphone Body ・Charging Case (2200mAh) ・USB-C Charging Cable ・Instruction Manual (Chinese) ※Google Translate compatible ・Color: Gray x Black 【About Shipping (Packaging)】 ・Free shipping / Anonymous delivery / With tracking number ・Ships within 1-2 days via "Yu-Packet Post". 【About Warranty】 ・Valid for 14 days after product arrival. ・If there are any problems, we will exchange or refund, so please contact us via transaction message.