Product Description:
The LiftMaster model 312HM is a single channel radio receiver that can operate on 12 volts DC or 18 to 30 volts AC and is ideal for commercial or gate opener applications. This LiftMaster 312HM radio receiver is compatible with the 315MHz frequency versions of  remotes controls by LiftMaster, Chamberlain and Sears Craftsman listed below. The LiftMaster 312HM receiver has more flexibility over other receivers by allowing it to accept a combination of Security+ and code switch 315MHz remote types in the normal security  mode or for maximum security only Security+ remotes in the high security mode. With the normal security mode it can accept any combination up to a maximum of 31 of the Security+ or code switch remotes. When set to the high security mode it can accept up to a  maximum of 15 Security+ remotes. When using the code switch remote it can accept an unlimited number remotes that are set to the same code switch settings. The relay output of the receiver is an isolated dry contact rated at 5 amps and can be set to provide a  momentary 1/4 second pulse or maintained contact while the remote is sending a signal, which is selected by an internal jumper. Having an F-connector type antenna allows for the antenna to be remotely located from the receiver using the optional 86LM remote  antenna kit (sold separately) to obtain maximum receiver range especially when if the receiver is located inside a metal enclosure that would block the signal. An optional power adapter LiftMaster 85LM (sold separately) can be used if the receivers required  operating power is not readily available. The LiftMaster 312HM receiver controls one door or gate opener. This item is new in box and includes approximately 20 feet connecting wire, 8 inch whip antenna and installation/programming instructions.
Note: Will not work with remotes that operate on 390MHz. Use the 412HM that operates on 390MHz available from our ebay store.

The LiftMaster 312HM radio receiver is compatible with the 315MHz Security+ and code switch remotes  listed below.
LiftMaster: 370LM, 371LM, 372LM, 373LM, 373W, 373P, 374LM, 890MAX, 893MAX 361LM, 362LM, 363LM or 333LM.
Chamberlain: 953D, 956D, 953EV, 956EV.
Sears Craftsman: 139.53752 (00953752000), 139.53753 (00953753000), 139.30498 (00930498000P), 139.30499 (00930499000P)
Wireless Keypads: 376LM, 377LM, 387LM, 379LM, 877MAX, KLIK2U, 139.53711 (00953711000)
Not all models maybe listed.

Product Features:
Activates one door or gate opener
Accepts up to 31 Security+ and/or digital code switch remotes
External 8" whip antenna with F-connector
2-piece aluminum case reduces possible radio interference
Isolated dry contact output with momentary or maintained closure option
Optional plug-in AC power adaptor LiftMaster 85LM (sold separately) connects to side located plug-in power connector
One-Year manufactures warranty

Product Specifications:
Power: 12 volt DC or 18 - 30 volts AC jumper selectable
Frequency: 315MHz
Codes: 15 Security+ in high security mode or 31 Security+ and or code switch in normal mode
Output: One normally open 5 amp @ 28 volts ac/dc contact with 1/4 second momentary or constant contact closure jumper selectable
Dimensions: 4.875 x 4.50 x 1.25 inches (excluding antenna connector)

If you are not positive that this is the correct item for you, please email us. We are more that happy to assist you in determining the correct item for your application. If you need to contact us for assistance please include the Make and Model number of the garage door opener, radio receiver or transmitter. The more information you include for us, the easier it is for us to assist you in determining the correct item. We would rather have you contact us than end up with the wrong item and have to return it.

Shipping: Most orders are shipped within 1 business day upon receipt of cleared payment. In the rare event that an item is temporarily out of stock and will take more than 2 business days to be available, we will notify you via email.
Note: Once your order has been shipped, we have no control over the time it takes the shipping carrier to deliver your order. Should you experience any problems in receiving your order, please contact us.
International Buyers – Please Note:
Import duties, taxes and collection charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility. Please check with your country’s customs office to determine what these additional costs will be prior to bidding/buying. These charges are normally collected by the delivering freight (shipping) company or when you pick the item up – do not confuse them for additional shipping charges.
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