This Radacat C1 Messenger is an off-grid SMS communication. These devices are shall work together with the smartphone. It must order a minimum of two devices to line up your private network. The power on your network, whenever and wherever you would like it. There is a central data storage so that messages can be sent through the internet when the devices cannot reach each other. The radical off-grid SMS & GPS communication the devices shall work with your smartphone together. The buyers need to order a minimum of two devices to set up their private network. The power is our network, whenever and wherever we need it. It has secured encryption no central data store so your private chats are end-to-end encrypted. You want to buy this device must order this from your nearest online store. It’s a very attractive device and easy to use.