This is the Compustar 1WAMR key fob.

Keyfob Description:
This is the Compustar 1-Way 1WAM-R Replacement Remote Control.
Compatible With These Systems:
1WAM-S, 1WAM-A, 1WAM-AS, Any AM frequency Compustar system
FCC ID:
O44J1WAM4R
IC ID:
1WAM4R
Model Number:
1WAM-R, 1WAM4R
Compatible Antenna Number:
ANT-1WAM, ANT-2WAM
Transmitting Frequency:
433 MHz AM
Is this a 1 Way Keyfob?:
Yes
Is this a 2 Way keyfob?:
No
Battery Type:
CR2025 X 2
Keyfob Colour:
Black
LED Colour:
Blue

This key fob works with the following antennas: