Introducing the revolutionary secure but low cost IPsec VPN server software for Raspberry 4 model B. "Secure" does not mean "expensive" any more. The VPN device with strong encryption is now available to general public at low cost. "Secure" does not mean "hard to use" any more. The complicated IPsec VPN setting is on us, you only need to change username and password. If you know how to type, you know how to configure this device. How It Works Turn your unused/retired Raspberry Pi 4 Model B into IPsec VPN server with the software shipped in the MicroSD card. Plug in this IPsec VPN server to your wireless router at home. Configure VPN client on your smart phones or PC on the go. All traffic from your smart phones or PC on the go will be encrypted and sent to VPN server which decrypts the traffic and accesses the internet for your smart phone. The return traffic is then encrypted by VPN server before it is to your smart phone. This sale includes: IPsec VPN server image in a brand new Genuine SanDisk MicroSD card. This software image is plug-n-play and it is good for the following Raspberry PI models. If you need VPN server software for other Raspberry Pi model, check my other items or contact us. Raspberry Pi 4 Model B The VPN server software image only runs in the MicroSD card shipped and the VPN software is licensed for 5 years. Buyer pays return shipping. We strive to maintain %100 positive feedback. Your satisfaction is guaranteed. If you have any issues, please contact us to resolve it before you leave negative or neutral feedback.