SOMMER 4020 TX03-868-4, 4026 TX03-868-4 compatible remote control replacement transmitter, 868.8Mhz rolling code keyfob High quality SOMMER compatible remote control replacement! Fully compatible with SOMMER 4020 TX03-868-4, 4026 TX03-868-4 remotes! Latest technology 868.8Mhz rolling code remote! Battery and keychain included! Distance up to 100 meters!