The components include a ‘Gumstix’ ARM Cortex-A8 computer with expansion board, Arduino Nano (for SPI display control), LED Bargraph (for wireless signal level, controlled by GPIO pin outs from Overo COM), powerful 802.11 board antenna, 3.7v battery, 64×32 pixel LCD RGB display (harvested from NKK ‘SmartSwitch), 5mm cardioid microphone and an 8Gb MicroSD card. The computer runs a modified Angstrom OS, a GNU/Linux embedded operating system popular on ARM devices