The Firefly 300MCD21K manufactured by Transmitter Solutions is a single button remote used to operate a garage door opener or gate that uses Multi-Code 300 MHz remotes. This remote features a convenience design that easily fits on a key chain or in your pocket. The 300MCD21K uses 10 binary (two position) switches giving you 1024 coding options.
Compatible with Linear Multi-Code 300 MHz products
Includes:
Single button remote
Key chain
12V battery
Instructions
Dimensions: 1 7/8" X 1 1/2" X 1/2"
Specifications:
Model: 300MCD21K
FCC ID: SU7CCF3001B
The Firefly 300MCD21K will work if you use any of the following radio controls:
Chamberlain: 300MC
Keystone Heddolf: M220
Linear: 109020, 109920, 109950, 302101, 302210, 302850, 306010, 307010, 308301, 308911, 412001, 414001, 420001
Transmitter Solutions: 300MCD21K, 300MCD21V, 300MCD22K, 300MCD22V, EMP300MCD21V, FFII300MCD21K
*May be compatible with additional Multi-Code remotes. Contact to confirm compatibility
Warranty: two years
How to Program a Firefly 300MCD21K Multi-Code Remote
1. Remove the screw from the back of the remote. Push the sides of the remote together long ways. This will create a gap in the remote to put your fingernail in to push the remote apart.
2. Locate the 10 switch code on the receiver or a working remote. Your garage or gate will have an external receiver that will have the 10 switch code in it. If you have a working remote it is usually easier to use the switches from the remote.
3. Move the switches in the new remote so they are in the same order as the receiver or working remote.
4. Press the remote. The garage or gate should operate. If the remote does not work then reverse all the switches.
To download the manufacturers instructions click here.