Sony ULT FIELD 1 Waterproof Portable Speaker - Off White (Open Box)

Big Bass, Bold Sound Anywhere You Go

Turn up the energy with the Sony ULT FIELD 1 (SRS-ULT10), a compact portable speaker that packs a punch with EXTRA BASS™ and ULT POWER SOUND for deep, thumping lows and crisp highs. Built for the on-the-go lifestyle, it’s dustproof and waterproof (IP67), making it perfect for any adventure. Enjoy up to 12 hours of battery life, along with Bluetooth 5.3 for effortless streaming. With app support for sound customization, this sleek and lightweight speaker is your ultimate choice for dynamic, portable sound wherever the fun takes you.

Hit the button, feel the bass

• EXTRA BASS™ & ULT POWER SOUND: For bold, punchy audio with deep, rich lows
• ULT Button: Turn ULT POWER SOUND on with the ULT button to enjoy powerful sound & enhanced bass
• Side Passive Radiator: Optimized to enhance bass sound
• Sound Diffusion Processor: Expands sound in any space with its DSP technology

Power meets portability

• Dual Speaker Units: 83 x 42mm woofer + 16mm tweeter for clear, balanced sound
• Stereo Pairing: Connect two ULT FIELD 1 speakers via Bluetooth® for true left/right stereo
• App Support: Sony | Music Center app for easy EQ customization and control
• Built-In Mic: Echo-canceling mic for clear hands-free calls

Built to go anywhere

• All-Weather Protection: IP67-rated waterproof, dustproof & shockproof for outdoor use
• Battery Life: Up to 12 hours of playtime on a single charge
• Bluetooth 5.3: Fast, stable wireless connectivity
• Compact & Lightweight: Approx. 650g with included strap for grab-and-go listening

The best portable Bluetooth speakers of 2025, tested by editors "The Sony Ult Field 1 lets you boost bass at the touch of a button, all while delivering 12 hours of battery within a waterproof and dustproof design."

What Does “Open Box” Mean?

This product is listed as an Open Box item. Open Box items are typically considered excess inventory from store shelves. They may have assorted stickers on the packaging and may have been exposed to customer contact. In addition, since most of these items have been returned from retail stores back to the warehouse, the packaging may show signs of extra handling. These products go through verification to ensure they are still in new condition and are repackaged as needed. Product comes with a 1-year warranty.

To learn more about Open Box products, click here.

Specs

• Brand: Sony
• Model: ULT FIELD 1
• Model number: SRS-ULT10
• Model year: 2024
• Color: off white
• Dimensions: 206 mm × 77 mm × 76 mm
• Weight: Approx. 650 g
• Speaker units:
  • Woofer: 83 mm × 42 mm
  • Tweeter: 16 mm
• Sound modes:
  • ULT POWER SOUND
  • EXTRA BASS™
• Bluetooth version: 5.3
• Supported profiles: A2DP, AVRCP, HFP, HSP, SPP
• Supported codecs: SBC, AAC
• Frequency response: 20 Hz–20,000 Hz
• Ports: USB Type-C (charging only)
• Battery life: Up to 12 hours
• Charging method: USB Type-C
• Water protection: IP67 (waterproof, dustproof, shockproof)
• App support: Sony | Music Center (EQ customization, playback control)
• Built-in microphone: Yes (with echo canceling)
• Aftermarket 1-year parts and labor warranty from third party

Compatibility

• Smartphones/Tablets

  • Works with both Android and iOS devices via Bluetooth.

  • Easily pair with popular brands like Samsung, Apple, Google Pixel, and OnePlus.

• Computers: Compatible with Windows and Mac laptops and desktops via Bluetooth for wireless audio streaming.

• Smart TVs & Other Bluetooth-enabled Devices:

  • Can connect with Bluetooth-enabled smart TVs, gaming consoles, and streaming devices (such as Chromecast, Roku, and Apple TV) for immersive audio.

• Bluetooth Audio Devices:

  • Easily pairs with other Bluetooth-enabled audio systems, Bluetooth receivers, and smart assistants.

Includes

• Sony ULT FIELD 1 Waterproof Portable Speaker - Off White (Open Box)
• Strap Belt
• USB-C Cable

• Ships to Contiguous US
• Expected Delivery: Oct 19 - Oct 25