Philips 4000 series TAH4205RD/00. Product type: Headset, Wearing style: Head-band, Recommended usage: Calls/Music. Connectivity technology: Wireless, USB connector: USB Type-C, Bluetooth profiles: A2DP,AVRCP,HFP,HSP. Ear coupling: Supraaural, Acoustic system: Closed, Headphone frequency: 20 - 20000 Hz. Microphone type: Built-in. Battery type: Built-in battery, Battery technology: Lithium Polymer (LiPo), Continuous audio playback time: 29 h |