A retrofittable curtain apparatus capable of being installed onto existing curtain tracks comprising a curtain and curtain carriers. The apparatus may comprise a pair of latches on either side to facilitate simple installation onto the curtain track by clamping the apparatus to the track. A pair of switches located on either side of the apparatus allows a user to activate the apparatus by tugging on the curtain, pulling it taut over the switch thereby actuating it. The apparatus comprises an internal assembly of efficiently arranged gears and motors that produce a substantially small horizontal form factor, allowing for use with wave fold curtains.