New HOT Wireless Detector Anti-Spy Signal RF Hidden Camera GSM Device Finder Dimension:6.8 x 5 x 1.6cm Detect that if your car or office is stuffed with wireless wiretap or surveillance devices. Detect if the cell phone is wiretapped or is abnormal ( transmit signals without any reason at standby). Effective range: 0-10m (3.2~32ft) Can effectively prevent eavesdropping, videotaping, fraud, protect personal privacy data and information confidential.