【360 Surround Hi-Fi Stereo Sound, Crystal Clear Calls】2025 Rulefiss wireless headphones produce impressively beautiful sound, using an AAC/SBC audio decoder and a 14.2mm composite diaphragm to increase the audio frequency by 75% (18Hz-25kHz). The instrumental details are layered, the vocals are clear, resonant bass and authentic highs ensure pure music. At the same time, the Bluetooth headset has 4 built-in clear microphones and ENC noise reduction technology, can retain 80% of the sound, making the call clearer. | 2025 Upgraded Bluetooth 5.4 - Rulefiss Q38 wireless earbuds use Bluetooth 5.4 technology and dual-channel transmission. Bluetooth headphones offer enhanced anti-interference capabilities and optimized channel hopping mechanisms, effectively protecting against external interference. Compared with Bluetooth 5.3, the transmission speed is +100%, stability is +70%, 41ms low latency. | 【56 Hours Playtime, Dual Power Display】The Bluetooth headphone charging case with LED display shows the remaining power in percentage. The charging case presents its battery from 1% to 100% to let you know the current power status of your earbuds and charging case anytime anywhere. Up to 6-8 hours of normal use playback on a single charge and boost up to 56 hours playtime with the compact 800mAh charging case. With Type-C fast charging, it only takes 1.5 hours to charge the case. | 【Comfortable Waterproof Sports Hooks,IP-X7 Waterproof】Unlike most wireless sports earbuds, Q38 headphones are designed with a soft, ultra-light and flexible 45° structure, which can fit your ears smoothly. And a single earbud is as light as 8g, equipped with 3 different sizes of high-quality silicone earplugs (S/M/L). Also with IP-X7 certified waterproof technology, you can protect the sports headphones from sweat and rain during sports or daily use. Best choice for workout, running, gym. | Smart Touch Control, Refined Appearance The multi-function touch panel on each sports earbud helps to play, pause, adjust volume, answer, end calls, activate Siri and Google Assistant more convenient. In addition, the appearance of the sports headphones is made of 100% shiny coating, with smooth lines, comfortable touch and exquisite appearance. | WIDE COMPATIBILITY, QUICK CONNECTION The wireless earbuds for sports are compatible with almost all Bluetooth enabled devices such as iOS, Android mobile phones, TV, smart watches, PC, tablets, laptops and more (not compatible with gaming devices). After pairing the devices for the first time, the Bluetooth earbuds will automatically connect when you take them out of the charging case.