Sony WH-CH520 Wireless On-Ear Bluetooth Headphones. Key information for shopping: These headphones offer up to 50 hours of battery life and stable Bluetooth connectivity. They feature a built-in microphone with noise suppression for clear hands-free calling. The Digital Sound Enhancement Engine (DSEE) helps restore lost harmonics for a more authentic listening experience. They are lightweight and designed for comfort, with an adjustable headband and soft padded earcups. The WH-CH520 supports multipoint connectivity, allowing pairing with two Bluetooth devices simultaneously.