Many of us rely on our smartphone or tablet to get work done on a daily basis. If you plan to type a lot on your smart device, you are better off investing in a decent Bluetooth keyboard. The Logitech K380 happens to be a Bluetooth keyboard that pairs with up to 3 devices, allowing you to instantly switch between them with the Easy-Switch buttons.
The keyboard automatically maps keys to supported shortcuts to help you out. It runs for 2 hours on 2 AAA batteries. The above video gives you a better idea what you get. The keyboard will sell for under $39.99.[Source]