Key Features & Specifications of the Sony WH-ULT900N/BCE (assumed based on similar models)

Sound Quality:

• Driver Type: 40mm dynamic drivers for powerful, clear, and well-balanced sound.
• Hi-Res Audio: Supports high-resolution audio, providing superior sound detail.
• LDAC Support: Allows for high-quality wireless streaming (up to 990 kbps), ensuring better sound over Bluetooth.
• Noise-Canceling Technology: Adaptive Noise Cancelling (ANC) with the help of an integrated QN1 processor for superior noise cancellation, automatically adjusting the level based on surroundings.
• Ambient Sound Mode: Lets in ambient noise for awareness when you need to hear your surroundings, like while walking or in busy environments.

Connectivity:

• Bluetooth Version: Bluetooth 5.2 for a stable and low-latency connection.
• Supported Codecs: SBC, AAC, LDAC, aptX (depending on model version).
• Wired Option: Comes with a detachable 3.5mm cable for wired listening, especially useful for planes or high-quality wired sources.
• USB-C Charging: Quick and convenient charging with USB Type-C, ensuring fast recharges.

Battery & Charging:

• Battery Life: Up to 30 hours of playback on a full charge with noise cancellation active.
• Quick Charge: 10-minute charging provides up to 5 hours of playback (depending on model and usage).
• Full Charging Time: Approximately 3 hours for a full charge.

Design & Comfort:

• Ergonomic Design: Lightweight and designed for comfort with plush earcups and an adjustable headband, making it suitable for long listening sessions.
• Foldable Design: Earcups fold flat for easy storage and portability.
• Materials: Premium materials like soft synthetic leather and memory foam for a comfortable fit.

Additional Features:

• Touch Controls: Touch-sensitive controls on the right earcup for volume, skipping tracks, and answering calls.
• Voice Assistant: Built-in support for Google Assistant and Amazon Alexa for hands-free control.
• Speak-to-Chat: Automatically pauses music when you speak and resumes once you stop talking.
• Multipoint Connectivity: Can connect to two devices at once (e.g., smartphone and laptop) and switch between them seamlessly.
• Customizable Sound: Through the Sony Headphones Connect App, users can adjust the EQ, ANC settings, and more.

Microphone & Call Features:

• Microphone: Multiple microphones for clear call quality and voice pickup.
• Wind Noise Reduction: Optimized for clearer calls even in windy environments.

Water Resistance:

• IP Rating: Typically, this class of headphones does not have an official IP rating, as they are intended for indoor and travel use.

In the Box:

• Sony WH-ULT900N/BCE wireless headphones.
• USB Type-C charging cable.
• 3.5mm audio cable.
• Carrying case.
• Quick start guide and safety instructions.

Summary of Key Features:

• Industry-leading noise cancellation with Adaptive Sound Control and QN1 processor.
• Premium sound quality with Hi-Res Audio and LDAC support.
• Up to 30 hours of battery life with noise canceling on.
• Multipoint connectivity and touch controls for ease of use.
• Comfortable and foldable design with premium materials for long-lasting comfort.
• Voice Assistant integration (Google Assistant and Alexa) and support for Speak-to-Chat.

The Sony WH-ULT900N/BCE (based on the similar WH-1000XM series) should be an excellent choice for people looking for top-tier noise-canceling headphones with great sound quality, long battery life, and additional features for everyday convenience, travel, and calls.

If the WH-ULT900N/BCE is a specific regional variant, I recommend checking Sony's official website or your local retailer for any additional information or differences.