Sony WH-CH520 Wireless On-Ear Headphones. Here's some information about these headphones: Key Features: They offer up to 50 hours of battery life, stable Bluetooth connectivity, and enhanced call performance with a built-in microphone and noise suppression. Sound Quality: They feature Digital Sound Enhancement Engine (DSEE) to restore lost harmonics during music compression and allow for personalized EQ settings through the Sony | Sound Connect app. Connectivity: These headphones support multipoint connectivity, allowing them to be paired with two Bluetooth devices simultaneously for seamless switching between devices like a phone and a laptop. Comfort: They are designed to be lightweight and comfortable for extended wear, with an adjustable headband and soft padded earcups.