SONY Truly Wireless Headphones Model Number: WF-C500 Model Year: 2021 Color: Black High-Quality Sound and Customizable: Excellent balance from high to low frequencies, with natural and clear vocals. DSEE upscales compressed audio to near CD quality, and you can also adjust the sound to your liking. Reliable Basic Performance: Ultra-lightweight at 5.4g for the main unit and 35g for the case. Despite its small size, it boasts high battery performance and a compact design for 20 hours of playback. Splash-Proof: With IPX4 splash-proof performance, you can enjoy music without worrying about rain or sweat. Simultaneous Left and Right Connection: Adopts a simultaneous left and right transmission method, ensuring stable connection and low latency regardless of your smartphone. Thank you for your consideration.