This device (#Versatile RF Signal Detector #WiFi IP Camera Detector #Cellphone Detector #Anti-Camera Solution #Counter Surveillance #GSM GPS tracker DETECTOR) is a VERSATILE RF signal detector which can detect most of GSM phone, 3G/4G smartphone, WiFi, GSM GPS tracker, Wireless and other wireless device during 50 MHz ~ 6.0 GHz.

1. Wide Detect Frequency Range: 50 MHz ~ 6.0 GHz, including GSM phone,   4G smartphone, WiFi, wireless bug (hidden microphone), wireless  analog cameras, digital cameras, IP camera and other wireless device  during 50 MHz ~ 6.0 GHz.

2. SEMI DIRECTIONAL ANTENNA: This feature is very helpful in locating  the signal source. When reducing the sensitivity to approaching the  signal source, the scan angle is also changing from wide to narrow.

3. Foolproof indication : 8 levels signal strength indication

4. Digital signal amplifier

5. Earphone for silent detection

6. Sensitivity tuner for distance adjustment and environment noise   elimination.

7. Standby / Idle phone registration detection

8. SH-055NV is also good in detecting SMS (Short Message Service) signal from GPS tracking devices. But, SH-055NV does not have the special filter as SH-055SDV, so it will beep or vibrate with all kinds of analog & digital signals. User is not easy to identify the SMS signal of GPS tracker.