How does it work? Simply put your car key safely in this anti-signal shielding case, it is impossible to unlock and start the car, effective blocking for radio signal in all directions such as /NFC /WiFi /GSM /LTE /GPS /Bluetooth /car remote etc.Mini Size Portable in Pocket - Lightweight and compact to hold a single key, this car key pouch is easy to slip into your pocket and portable anywhere in 11.7 size x 7.3cm. No more fear of electronic theft when sleeping at home, staying at a petrol station, dining out or paying for purchases at the checkout.Suitable for Which type of key? For securing radio keys of all common car brands and vehicle types with keyless entry (except Renault cards), also for radio transmitters such as access keys, duplicate keys or door opener remotes. garage door.Unique Keychain to Pull the Key in 1s - Our locking case is the one and only with a keychain chain on the market: you simply have to reverse the pocket and here is the key tie the chain between your hands. No more fumbling for the key in the pocket with difficulty or worrying that the key will fall to the ground.Reliable Protection with Tangible Quality - Special 3-layer nano-technology double-weave fabric guarantees the security of the car key signal Leak-Free Using carbon fiber material, this car key case features a nice tangible quality of soft, waterproof and wear-resistant. Lifetime Money Back Guarantee is always available.