Check the listing for details. Linear MegaCode Custom Coded Key Ring Transmitter, 1-Channel. Color: N/A, Condition: New. Listed at 29.60 USD. The Linear MegaCode Custom Coded Key Ring Transmitter is a remote keyfob used to control any Linear access control receiver or controller. The transmitter is preprogrammed at the factory in MegaCode format with one or four (select 1-channel or 4-channel) of more than 1,000,000 possible codes. For added security, the transmitter features a 10-second timeout to prevent a single transmitter from transmitting continuously.Works with Linear access control receivers and controllersMore than 1,000,000 possible codes eliminate chance of duplicationIncludes quick-disconnect key ring ContentsTransmitterKey RingBatteries Technical DetailsPower Source: Two (2) Type 2016 "coin cell" lithium batteriesBattery Life: Up to 5 yearsCodes: Custom block coded in MegaCode formatRF Frequency: 318 MHzDimensions: 1.25(W) x 2.25(H) x 0.48(D) inchesWarranty: 1 Year LimitedModel: 1-ChannelManufacturer Part No: ACP00939