usb car gps signal interference bloc ker portable shield an ti tracking stalking privacy protection positioning 12v/24v

1. effectively prevent gps and beidou satellite positioning and tracking, shielding range is 5-20m. 2. effectively interfere with gps and beidou satellite signals, protect your whereabouts privacy and information confidentiality.
3. interfere with all current gps global positioning systems and beidou positioning systems. 4. does not affect the normal use of mobile phones or other electronic devices.
5. suitable for 12v or 24v car, but it cannot exceed 24v. 6. compact size, high power, light weight, large coverage and easy to carry.condition:.syi