This concealed Ultrasonic Voice Silencer can achieve dual protection from the recording end of the eavesdropping device to the transmission chain. While interfering with the normal operation of the recording device, the P-US48 can also cover the common channels such as 4G calls, text messages, mobile network data and WiFi transmission. Even if the other party’s mobile phone tries to leak information through “recording upload”, it will eventually fail to synchronize due to signal interruption.
The anti-spy recording and 4G signal blocker adopts a disc structure as a whole, and cooperates with the circular ultrasonic emission array to achieve 360-degree omnidirectional coverage. The compact shape is easy to hide in daily scenes (piles of documents, between office equipment), and the non-slip soft rubber base can remain stable even on a smooth desktop.
Overview of functional features:
| Function item | Description |
| Ultrasonic emission units | 48 (circular distribution) |
| Coverage angle | 360° omnidirectional without dead angle interference |
| Interference frequency type | dynamic random frequency shift, real-time frequency hopping |
| Communication interference capability | ✅ Support 4G, WiFi multi-channel blocking |
| Camera interference effect | ✅ Some mobile phone cameras (blurred picture/exposure error) |
| Remote control function | ✅ Infrared remote control, remote control |
| Operation noise | 0 dB, silent operation |
| Power supply method | built-in 4700 mAh battery, supports 60 minutes of operation in standard mode |
| Applicable placement height | desktop 1~8cm strong coverage |
| Measured interference efficiency | more than 95%, high stability |
| Recommended use scenarios | indoor meetings, multi-person conversations, temporary deployment |
Notice:
- The remote control is infrared controlled, and it is recommended to use it without obstruction for best results.
- Camera interference is a secondary effect, not a primary function, and is not guaranteed to be 100% effective for all models.
- This device is designed for portable short-range use, and the best coverage range is recommended to be within 5 meters. If large-area spatial interference is required, multiple devices can be deployed in a distributed manner.
P-US48 Specifications:
– Signal suppression radius: 1-5 meters
– Battery life in three modes: up to 1 hour
– Autonomous operation in ultrasonic mode only: up to 2 hours
– Power supply: 12V, 5A
– Dimensions: Ф180х82 mm
– Weight: 1 kg
– RF suppression frequencies:
CDMA 850: 851-894 MHz
PCS: 1920-1990 MHz
3G: 2110-2170 MHz
4G: 790-830 MHz
4G 2500: 2496-2690 MHz
WiFi 2.4G: 2400-2484 MHz
GPS L1: 1570-1620 MHz
