Frequency: 390MHz
FCC Number: XAB-HEDDI-C220
DIP Switch: 2P 12T
Size: 3 1/2" x 2 1/4" x 3/4"
Color Code: Blue
Battery: 9V / 6F22 included 
Compatibility: Overhead, Genie, GT912, 912, GT90, GT90-1, GT90-3 and MAT90, Keystone Heddolf G220-1KA.

This product has dual function. It is compatible with both 9 dip switch and 12 dip switch receivers.

There are 12 dip switches on your transmitter each of which can be placed in two
different positions (ON\OFF).

These should be placed in the exact same position as the switches on your receiver.

For some receivers which have only 9 dip switches it will be necessary for you to move the small black code terminal to connect with pins 2 & 3.

For the 9 dip switch model receivers the code selection of the
dip switches on your transmitter 1 thru 9 should be set exactly the same as those
on your receiver.

Switches 10, 11 & 12 on the transmitter should be set in the off
position.
Do not set all switches to the same position, such as 100% ON or 100% OFF.