Bundle Includes: Sony WF-1000XM4 True Wireless Noise Canceling In-Ear Headphones (Black) and silicone case with carabiner Listen all Day, Charge in Minutes: You can enjoy a full working day of charge – 8 hours – from your headphones and store another 16 hours in the case. That means a full 24 hours of listening time every time you leave the house. In a hurry? Just a 5-minute quick charge gives you up to 60 minutes of playtime Easy Wireless Charging with Qi Technology: No cables necessary – the WF-1000XM4 features Qi technology for easy wireless charging. You can even use a smartphone with Qi technology, like the latest Xperia models with reverse wireless charging, to charge your headphones and charging case A Clearer, More Stable Bluetooth Signal: The optimization of the transmission algorithm with the Integrated Processor V1 has made the connection more stable and less prone to sound skipping, even in an environment where there is interference. It allows sound to be transmitted to both ears at the same time with very low latency, and with a higher signal strength than ever before Everything's at Your Fingertips: The WF-1000XM4 headphones feature intuitive touch control settings – for example, tap on the left earbud to change from Noise Canceling to Ambient Sound and long tap for Quick Attention, or double tap on the right to skip to the next track. What's more, you can assign your own functions to each earbud using the Headphones Connect app