Quantity   Component name
1 × Sony Ericsson MMR-70 FM Transmitter
1 × Adafruit 0.56" 4-Digit 7-Segment Display w/I2C Backpack https://www.adafruit.com/products/880
1 × Adafruit Pro Trinket - 3V 12MHz https://www.adafruit.com/products/2010
2 × Button switches http://www.adafruit.com/products/367
2 × 10 KOhms resistors Pull-up resitors for the switches
2 × 100 Ohms resistors Protecting the input pins. Just in case.
1 × Prototyping supplies Breadboard, jumper wires, wires, solder, soldering iron, ...