Used a few times for operational verification. These are lightweight, ear-hook style, wireless earphones compatible with LDAC. <From the product description page> ・【EarFun's first ear-hook earphones, achieving amazing comfort】"EarFun OpenJump" features an ultra-lightweight design, weighing only 7.8g per ear, so you won't get tired even after long hours of use. The open-ear design allows you to enjoy music while naturally hearing the surrounding sounds. Furthermore, the ear hooks, which combine titanium shape-memory alloy and liquid silicone, fit the shape of your ear and stay securely in place even during intense exercise. They are perfect for running and use at the gym. ・【High-resolution certification & LDAC support for high-quality sound】LDAC support reproduces high-resolution sound wirelessly, and it has obtained Hi-Res Wireless certification. You can enjoy a sound with a sense of realism, as if you were in a studio, from delicate nuances to powerful bass. ・【Reproduces rich sound details and powerful bass】EarFun's proprietary bass enhancement technology "BassSurge" achieves deep, rich bass. Furthermore, the 14.2mm high-quality wool composite dynamic driver produces clear and balanced sound. From high to low frequencies, it faithfully reproduces a wide range of sounds, allowing you to fully appreciate the details of the music. ・【Clear calls & IPX7 waterproof performance】Equipped with 4 high-performance microphones and AI noise-canceling technology, effectively cutting out ambient noise during calls. It is compatible with the IPX7 waterproof standard, making it resistant to sweat and rain, and can be used extensively for sports and outdoor activities. *Only the earphone body is waterproof. Please note that the charging case is not waterproof. ・【Up to 42 hours of continuous playback & wireless charging support】Up to 11 hours of continuous playback with the earphones alone (when LDAC is off), and up to 42 hours when combined with the charging case. Supports wireless charging, allowing you to easily charge by simply placing it on a charging pad. ・【Multi-point connection & Google Fast Pair support】Equipped with a multi-point connection function that can connect to up to 2 devices simultaneously. Furthermore, it supports Google Fast Pair, allowing for easy and speedy pairing with Android devices.