A system which marries a tethered, digital bus with image broadcasting to allow multiple, low-cost cameras to communicate with a host. The ratchet members are mounted on the rope reel so as to engage with a control member that is rotatably attached to a reel shaft with a rotational resistance imparted thereto, so that the ratchet members are turned radially outwardly to engage with a drive pulley, to thereby allow the drive pulley to rotate integrally with the rope reel. Where two fragrances are provided, the evaporation may be by respective electrical heaters. The heat sink can include a core member from which fins extend.