The black BTD10 Wireless On-Ear Monitor Headphones from Panasonic operate on Bluetooth version 3.0 and feature NFC pairing support, and an integrated microphone for taking calls from your compatible smart device. The headphones have 40mm drivers tuned to provide accurate mids and highs with accentuated bass. A built-in rechargeable battery provides up to 30 hours of operation per charge. Not limited to Bluetooth functionality, the BTD10 includes a 3.5mm cable for use with wired sources. A USB charging cable is also included.