Photochromic and acidochromic properties of dithienylethene-indolino[2,1-b]oxa-zolidine dyads and triads along with their reduced forms were investigated. Upon protonation the pi-conjugated system is greatly increased. The resulting acidoinduced indoleninium species deeply influence the maxima absorption of the dithienylethene subunits whose maxima for the closed forms is red-shifted to the infrared region. These examples constitute a promising approach towards multi-addressable molecular switches based on diarylethenes.