[Reliable Bluetooth andamp Type-C Charging] Featuring Bluetooth with a 10-meter transmission range, these headphones provide stable wireless connectivity and quick recharging via the Type-C interface [Battery Display] Stay informed with the built-in battery level display, letting you know exactly when itandrsquo s time to recharge [Versatile TF Card andamp 3.5mm Jack Options] In addition to Bluetooth connectivity, these headphones support TF cards for direct playback and come with a 3.5mm audio jack, giving you versatile options [Premium 40mm Speakers] Equipped with 40mm drivers, experience clear, high-quality audio across a wide frequency range from 20Hz to 20kHz [Convenient Control Features] Manage your listening experience with easy-to-use button controls for volume adjustment, track switching, call handling, redialing, voice prompts, Siri activation, and Bluetooth reconnection Specifications: Speaker: 40mm Battery: 250mAh Working time: 17 hours Standby time: 170 hours Charging time: 2.5-3 hours Charging voltage: DC 5V Connector: Type-C interface Transmission range: 10 meters Frequency response: 20 Hz-20 kHz Functions: adjust volume, switch songs, answer calls, reject calls, hang up calls, Bluetooth playback, call replay, Bluetooth reconnection, voice prompts, power display, MP3, Siri wake-up