--- product_id: 14860180 title: "Firefly 390LMD21K Keychain Remote 61LM LiftMaster" brand: "transmitter solutions" price: "€ 31.56" currency: EUR in_stock: true category: "Transmitter Solutions" url: https://www.desertcart.be/products/14860180-firefly-390lmd21k-keychain-remote-61lm-liftmaster store_origin: BE region: Belgium --- # 2x2x0.5 inches 5-year battery life Keychain model Firefly 390LMD21K Keychain Remote 61LM LiftMaster **Brand:** transmitter solutions **Price:** € 31.56 **Availability:** ✅ In Stock ## Summary > Unlock the Future! 🔓 ## Quick Answers - **What is this?** Firefly 390LMD21K Keychain Remote 61LM LiftMaster by transmitter solutions - **How much does it cost?** € 31.56 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/14860180-firefly-390lmd21k-keychain-remote-61lm-liftmaster) ## Best For - transmitter solutions enthusiasts ## Why This Product - Trusted transmitter solutions brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Versatile Design:** Available in stylish blue with green or sleek black with blue buttons. - • **Long-lasting Power:** Enjoy up to 5 years of battery life without the hassle of replacements. - • **Compact Convenience:** Easily fits in your pocket or bag for on-the-go access. - • **Reliable Performance:** Operates on a secure 390 MHz frequency with 9 dip switches. - • **User-friendly Operation:** One-button functionality for quick and easy access. ## Overview The Firefly 390LMD21K Keychain Remote is a compact and stylish remote designed for convenience and reliability. Weighing just 0.8 ounces and measuring 2 x 2 x 0.5 inches, it features a one-button operation and operates on a secure 390 MHz frequency with 9 dip switches. With a battery life of up to 5 years, this remote is perfect for those who value both style and functionality. ## Description Compatibility: Liftmaster 61LM CONTENTS This remote is a very small (1/2" x 1-7/8" x 1-1/2") key-chain style remote operating at 390 MHz. It achieves its small size by using state-of-the-art components. It has been designed for use with; LiftMaster dip-switch receivers. CODING Access to the remote's toggle code switch is achieved by unscrewing the back cover. Set the NINE-digit toggle code switch to match the code set in the receiver. Move switches using a small pointed object, such as a paper clip. Gently switch the small switches to either +, -, or Neutral positions. When complete screw the back cover back into position OPERATION Once the codes are set to match the transmitter codes, you may test the system. Ensure the gate or door is visible and clear before testing. Step 1- Push the remote's button from a distance of about ten feet. If the receiver activates, the switches are properly set. Step 2- Test the transmitter from several locations to discover any "blind spots" caused by interference. BATTERY ACCESS Unscrew the back cover to reach battery compartment. Be aware of battery polarity when replacing the A23 battery. TECHNICAL SPECIFICATIONS Operating Frequency- 390 MHz Number of Buttons- 1 Battery- 1 ea. 12V A23 Number Combinations- Lots :-) Operating Temperature- -20F - 100F Overall Dimensions- 1/2" x 1-7/8" x 1-1/2" Weight- 1 oz. COMPATIBLE REMOTE'S LiftMaster 61LM, 62LM & 63LM Chamberlain 750CB, 753CB & 756CB Sears Craftsman 139.5100, 139.5300, 139.53100, 139.53106, 139.53110, 139.53200, 139.532006, 139.53210, 139.53300, 139.533006, 139.53310, 139.53315, 139.53400, 139.53403, 139.53413, 139.53500, 139.535006, 139.53510, 139.53513, 139.53515, 139.53600, 139.536006, 139.53601, 139.53602, 139.53603, 139.536036, 139.53604, 139.53605, 139.53606, 139.53607, 139.53608, 139.53609, 139.53610, 139.53611, 139.53612, 139.53613, 139.53622, 139.53632, 139.53707, 139.53708, 139.53718, 139.53758, 139.53778, 139.5225SRT, 139.53225SRT, 139.53315S ## Features - Blue w green button, or Black w blue button (new model) - One-button - Key chain model - 9 dip switches - 390 MHz ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Transmitter Solutions | | Part Number | 390LMD21K | | Item Weight | 0.8 ounces | | Product Dimensions | 2 x 2 x 0.5 inches | | Item model number | firefly 390LMD21K | | Is Discontinued By Manufacturer | No | | Item Package Quantity | 1 | | Batteries Included? | Yes | | Batteries Required? | No | | Battery Cell Type | Alkaline | | Average Battery Life | 5 years | ## Images ![Firefly 390LMD21K Keychain Remote 61LM LiftMaster - Image 1](https://m.media-amazon.com/images/I/3128oQL61GL.jpg) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/14860180-firefly-390lmd21k-keychain-remote-61lm-liftmaster](https://www.desertcart.be/products/14860180-firefly-390lmd21k-keychain-remote-61lm-liftmaster) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-09-18*