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Hi 0ICY0, Thank you so much for your inquiry! Here are the key features of each model: The WH-XB900N features an EXTRA BASS for impressively deep, punchy sound and has over-ear wearing style design. Their battery can last up to 30 hours, so you can keep on listening to your favorite music all day. Be sure to download the Sony | Headphones Connect App to customize your listening experience with ASC (Adaptive Sound Control), an equalizer, and more. Plus, you have the ability to use the convenient smart features, including Quick Attention, Google Assistant/Alexa/Siri compatibility, and touch controls. For the WH-1000XM4, we gently adjusted the design of these headphones. We added more cushioning to the headband and ear padding. We also changed the headphones' outside dimensions slightly, so they sit more comfortably over your head. Also, the WH1000XM4 features smart listening technology to enhance your listening. With this, you can simply start speaking to automatically pause your music in Speak-to-Chat, or enjoy adaptive playback thanks to the proximity sensor and two acceleration sensors that detect whether your headphones are being worn or not. The WH-1000XM4 is a new design, with intelligent and intuitive Ambient Sound Control features that include improvements to Multipoint connection and our industry-leading Noise Cancelation, exceptional sound quality, and Smart Listening that adjusts to your behavior and location. Thanks again for considering Sony! Hope this helps, Jess
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