WH-1000XM4 Wireless Over-Ear Headphones with Battery Display Bluetooth Headset Support TF Card - Black [Reliable Bluetooth and 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 it's time to recharge [Versatile TF Card and 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 Package included: 1 x Headset 1 x Charging Cable 1 x English and Chinese User Manual Other items not include