Give you security for privacy!

Feature:
 - Detecting frequency range: 3MHz~3000MHz
 - Battery can use 32 hours continuously
 - Detecting distance is about 4~6M
 - Small volume to easy take (8.3*3.9*1.5cm + - 42g)
 - Distinguish between digital and analogy signal
 - Just switch on to detect signal, don't need to keep pressing the button.