Sony's wireless headband headphones released on March 3, 2023. I am selling them because they didn't fit my ears. ◯ Color: White ◯ Purchase Date: September 30th ◯ Purchase Price: ¥6,940 ◯ Contents: Main unit, charging cable, instruction manual, warranty, 2 receipts ◯ Number of Uses: 2 times The following is a quote from the SONY official website. URL. https://www.sony.jp/headphone/products/WH-CH520/ The sound is well-balanced from high to low frequencies, and you can enjoy vocals and instruments with natural and clear sound. Furthermore, with Sony's proprietary technology "DSEE", the high frequencies that tend to be lost in compressed sound sources are compensated within the headphones to the equivalent of CD quality. Compressed sound sources such as streaming playback, MP3, and Bluetooth transmission codecs are played back with a wide and good sound. Main Specifications Headphone section (other) Power supply DC 3.7 V: Built-in rechargeable lithium-ion battery Charging time About 3 hours Charging method USB charging Battery life (continuous audio playback time) Up to 50 hours Battery life (continuous talk time) Up to 40 hours Bluetooth Communication method Bluetooth standard Ver. 5.2 Output Bluetooth standard Power Class 1 Maximum communication distance 10m Operating frequency band 2.4 GHz band (2.4000 GHz - 2.4835 GHz) Supported Bluetooth profiles *1A2DP, AVRCP, HFP, HSP Supported codecs *2SBC, AAC Supported content protection SCMS-T transmission band (A2DP) 20Hz-20,000Hz (44.1kHz sampling) *1 Bluetooth profile is a standardization of functions for each characteristic of Bluetooth products. *2 Refers to the audio compression conversion method