The Ledger Blue is a premium hardware wallet created by the company ‘Ledger SAS’. It is the size of an average cellphone and it has a touch-screen display for better user experience. It can be connected to your computer via a micro-usb cable and is supported by most operating systems. It is not the successor of the Ledger Nano S, but a new device in the company’s product line.
The Ledger Blue is 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. 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.