Keep your conversations private. Stay connected. Keep your conversations private. Stay connected.
Stop phone recordings without blocking any signals.
The old choice was simple: stay reachable or stay protected.
Until now, people who wanted privacy often had to turn their phones off, leave them outside the room or collect devices before important conversations.
That may reduce recording risk, but it creates a new problem: you become unreachable. Guardian removes that trade-off.
Trusted by offices and meeting rooms in 32+ countries.
- Works offline
- No Wi‑Fi, Bluetooth, or internet required.
- No configuration
- Ready to use out of the box.
Zero setup. - Designed in Austria
- Software and hardware designed in-house.
Hear Guardian in action
See how Guardian Ultrasonic blocks phone recordings in a real-world side-by-side test.
Order your Guardian.
A one-time purchase — no subscription. Free worldwide shipping on 2+ units, backed by 14-day returns and a secure checkout.
- Free shipping
- 2+ units
- 5% off
- 3+ units
- 10% off
- 5+ units
Quantity
Discounts update automatically
- 1 × Guardian Ultrasonic
- $649.00
- Discount
trusted by companies worldwide
Protecting customers in 32+ countries
Made in Europe
Hardware and software are fully designed by us in Austria.
Every component is designed and engineered by our team in Austria — from the circuit board to the firmware.
No outsourced modules, no third-party software. Full control over every layer means no hidden backdoors and no compromises on quality.
Technical SpecsFAQ
Is Guardian Ultrasonic a jammer? + −
No, not in the traditional sense. It doesn't block radio signals like mobile data, Wi-Fi, or Bluetooth. Guardian Ultrasonic uses ultrasonic acoustic waves (high-frequency sound) to physically interfere with microphones.
Does it block all microphones in the room? + −
Guardian Ultrasonic is designed to protect you from your devices recording your private conversations. It does not cover the whole room. (Be careful with products claiming to do so — they are usually misleading.)
Does it work with phone cases? + −
Yes, it works with most phone cases. Certain phone cases with a subpar build quality can sometimes block the microphone slightly. In those situations simply place the phone on the device without a case.
How should I transport the device? + −
Flip the power switch on the bottom to off. Use the original product packaging or a padded bag — the product packaging was specifically designed to protect the device during transport and includes space for the USB-C charging cable.
How do I store the device? + −
Flip the power switch on the bottom to off. You can still charge the battery while it's off. Store it in a dry place, away from heat or direct sunlight.
Is Guardian Ultrasonic safe for my phone? + −
Yes, it is safe. It doesn't affect your phone in any harmful way. The ultrasonic waves target microphones only and the device has been in use in our offices for a long time without issues.
Order with confidence.
- Fast shipping
- Ship out within 2-5 business days
- Free 14-day return
- No reason needed. Free return shipping & full refund.
- One-year warranty
- Warranty period subject to local laws
Guardian Ultrasonic