Quantity   Component name
1 × Raspberry Pi Model B
1 × Bluetooth USB key
1 × >= 4Go SD card
1 × Serial Thermal Printer CSN - A2, such as the Adafruit one
1 × >= 2A Power supply 5v, such as Battery - 5v/2A regulator
1 × Small screen choose your preferred one, not a power consumer as mine
1 × Buttons
1 × A better case Or for lazy people like me, a Tupperware...