Sony WH-CH520 Bluetooth On-ear Wireless Headphones Qualities From compressed music sources, the Digital Sound Enhancement Engine (DSEE) recovers lost sound. Quick Charge allows for a 50-hour battery life (3 minutes of charging equals 90 minutes of playback). Comfort was a priority in its design, as evidenced by the lightweight (147g), soft earpads, and adjustable headband. Multipoint Connection: pair two devices at once, such as a phone and a PC, using Windows Swift Pair and Google Fast Pair on Bluetooth Ver. 5.2 for easy pairing. Hands-free calls that are crystal clear and have a good built-in microphone connects to Siri or Google Assistant, the voice assistant on your smartphone. Use the Sony Headphones Connect app (iOS/Android) to customize the sound to your liking.