Autopage XT-43LCD 4-Button 2-Way LCD Paging Replacement Transmitter Remote 433.92MHz FCC H50TR29 H5OTR29 4-Button 2-way LCD paging transmitter remote (Replacement for XT-42LCD, XT-72LCD, XT-73LCD) FCC ID: H50TR29 H5OTR29 (Replacement for H50TR07AM H5OTR07AM, H50TR13 H5OTR13) AM, supereheterodyne (SAW), 433.92MHz, AAA battery powered Works for RF-420, RF-425, RF-425A, RF-520, RF-525, RS-622, RS-625, RS-625A, RS-665-2W, RS-665-2WA, RS-720, RS-725, RS-727, RS-727A NOTE: Daily timer start and temperature control start features not available on this remote if old remote has clock and temperature