I made an impulse purchase in December 2023, but I hardly used it, so I'm selling it. Comes with a YAMADA Denki warranty sticker receipt (within the warranty period). [Product Introduction] Brand: SONY (Sony) Color: Black Ear Placement: On-Ear Headphone Type: On-Ear Noise Control: None Model Name: WH-CH520 The sound is well-balanced from high to low frequencies, allowing you to enjoy vocals and instruments with natural and clear sound. Furthermore, with Sony's proprietary technology "DSEE," the high-frequency range that tends to be lost in compressed sound sources is compensated within the headphones to the equivalent of CD quality. It reproduces compressed sound sources from streaming playback, MP3, and Bluetooth transmission codecs with a wide and good sound. Compatible with the dedicated app "Headphones Connect," you can customize the sound quality to your liking. By using the "Equalizer," you can select from 8 presets such as "Relaxed" and "Bass Boost," or customize your own equalizer settings. It uses ear pads made of smooth, low-rebound urethane foam with few wrinkles. The soft and comfortable ear pads provide a lightweight and comfortable fit. It allows for music playback for up to 50 hours (*). Furthermore, it supports quick charging, allowing for approximately 1.5 hours (approximately 5.5 hours with 10 minutes of charging) of playback (*) with a 3-minute charge. Hands-free calls (*) are possible on smartphones, iPhones, and PCs. * Smartphones, iPhones, and PCs must have Bluetooth functionality and support HFP or HSP. It may not be compatible depending on your software and environment. Sony Model Name...WH-CH520