While developing this product the following features and vulnerabilities of modern mobile phones were taken into account:

The smartphone can be intentionally, or covertly, ‘off-hook during important negotiations
Voice recording software can intentionally, or secretly, run on the smartphone
Listening software can run in a ‘stealth’ mode
Spyware can be installed on the smartphone without the owner's knowledge, allowing attackers to activate covert eavesdropping around the phone. There are known cases of transmission of such software by exploiting the vulnerabilities of some messengers
The acoustic environment around the phone can be transmitted to the server, or cloud service of the attackers either in real time or with a postponed uploading
Smartphone apps that have access to the phone's microphone can be used for eavesdropping in cases of them having been hacked (usually messengers or social network apps)
Uploading of information can be done in the following ways: Conventional voice call; Mobile internet; Wi-Fi; Bluetooth; The phone's connector
Other audio security devices use radio interference to protect conversations. Unfortunately, the creation of radio interference (RF jamming mobile communications, Wi-Fi and Bluetooth) does not guarantee protection: there is still the possibility of accumulating information in the phone's memory (voice recorder mode). Given this factor, the only reliable way to protect is to block the phone's acoustic channel. This prevents acoustic information from leaking, regardless of how it is listened to or transmitted. A number of modern technologies have been used in the PHONE SAFE ULTRA device for your protection.

Features and advantages

Blocks the microphone of the phone with the help of non-filterable ultrasonic interference
Efficiently prevents surround recording app from capturing conversations and sounds
The frequency of interference has been optimally selected for the best performance and affects all existing models of smartphones
Made with the design of an attractive natural wood stand
The acoustically isolated phone can remain close to the owner where the screen can be easily observed
The phone stays online and is available for incoming calls
No illegal radio jamming
Can be powered by the external USB, or from the built-in rechargeable battery
Has 2 sensors, increasing the battery’s resource: the device starts producing interference when a phone is inserted (IN USE sensor) and a conversation is present (ACTIVITY sensor)
The rechargeable battery provides a continuous working time of 6 hours if the USB source is unavailable
Is compatible with all types of phones (max. width 88 mm)

Specifications

Power of noise <2 W in the active area
Guaranteed suppression area 10 cm from the transducer
Power Source1) USB 5V 2) Built-in rechargeable battery
Current consumption 500 mA (noise mode) 5 mA (stand-by mode)
Current consumption 500 mA (noise mode) 5 mA (stand-by mode)
Battery Li-Ion, 3.2 В, 3200 mAh
Connector Mini USB;
Battery resource 6 hours
Recharging time 6 hours