ʻO kahi mea hoʻohana no ka mālama ʻana i ka ea ea mamao, ua hana mua ʻia ka mea hoʻokele ea i kahi papa kaapuni i hoʻohui ʻia a me nā pihi i hoʻohana ʻia e hana i nā memo like ʻole.ʻO kahi puʻupuʻu microprocessor e hoʻopuka i ka hōʻailona mana mamao, kahi oscillator kristal, kahi transistor hoʻonui, kahi diode kukui uila infrared, a me kahi papa keyboard ka hapa nui o ka mana mamao.