This Faraday bag is a signal blocking wallet case that can be used to protect your privacy and block phone calls when you need. It can also block GPS signal to avoid tracking. It is widely applied to mobile phones, car keys, credit cards, ID cards, etc. It is lightweight and easy to carry. Practical and effective signal blocking bag, which can protect you from some unwanted phone calls during your trip. When the phone is placed in the outer bag, it can receive the signal normally, and it will effectively block the signal when placed in the inner bag. Please pay attention to whether the size of the bag is suitable for your mobile phone before ordering. The car key signal shielding bag is designed to provide anti-theft security protection for your car key and phone, protecting them from unauthorized access and tracking.