This TM-27 Mhz (TM27) is suit for ladermatic Roller Door Operators. The coding is set by the combination of 9 dip switches inside the remote each with three positions (+, 0 and -), which is called Trinary coding.
This garage door remote may look similar to the remote GTXU1 or GTXU2, which indeed are completely different inside and therefore not compatible with each other. TM-27 has marking on the back cover of the transmitter. GTXU1, GTXU2 use 6-volts batteries.