The Ledger Nano S is a hardware wallet created by the company ‘Ledger SAS’. It is the size of an average USB stick and it has a small display. It can be connected to your computer via a micro-usb cable and is supported by most operating systems. Well over 1 million devices are sold worldwide.
It is considered a very secure wallet with state-of-the-art security. According to the company your private key is never exposed. It is protected within a secure chip and locked by a PIN code. There are 2 buttons on top for navigating through the menu and signing transactions. Mulitple blockchains are supported with more and more being added. There is an app called, The Ledger Live companion app, which enables users to check your balance and send or receive cryptocurrencies and tokens.