The Muse M-215 BTB are blue on-ear closed-back headphones designed for versatile audio use, offering both wireless and wired connection types. They utilize Bluetooth 5.0 with HSP, HFP, A2DP, and AVRCP profiles to ensure a stable wireless connection, while a built-in microphone allows you to handle calls hands-free. For those who prefer a wired setup or find their battery low, a 3.5 mm Aux In port is available. These headphones feature 40 mm speakers with a frequency response of 20 Hz to 20,000 Hz and a signal-to-noise ratio of 90 dBA. To protect different types of listeners, they offer two sensitivity settings: a kid mode at 85dB and an adult mode at 90dB. The lightweight frame is constructed from ABS plastic and PU leather, weighing only 115 g to keep them comfortable during extended wear, complemented by an adjustable headband for a secure fit. A unique content sharing function allows two users to listen to the same audio source simultaneously using the included sharing cable. Power is provided by a 150 mAh battery that delivers about 13 hours of playback at medium volume and recharges via a modern USB-C port. The package comes complete with the headphones, a USB-C charging cable, an Aux-in cable, and the dedicated sharing cable.