To build a remote, you will need a Bluefruit, several buttons, breadboard and wires. Also you need a power supply. You can use a Lithium battery or a 3xAA or 3xAAA battery pack to make it portable.

The wiring is pretty simple. For each button, one end needs to be connected to ground, and the other one should be connected to one key pin of Bluefruit. And you need to connect power to Vin and GND.