XP Deus II 11-inch Round FMF Waterproof Search Coil with Lower Pole and Hardware

The 11-inch FMF coil is compatible exclusively with the XP Deus II metal detector. The FMF coil family uses a wireless protocol and frequency architecture specific to the Deus II platform, and it will not pair with legacy XP detectors like the original Deus or ORX, nor with third-party detectors. If you own a Deus II and need a replacement or additional coil, the FMF lineup is your only option.

The 11-inch FMF coil balances ground coverage and target separation between the 9-inch and 13 x 11-inch models. The 9-inch coil offers tighter target separation in trashy ground, making it ideal for urban parks with dense iron. The 13 x 11-inch elliptical coil covers more ground per sweep, a time advantage on large open fields and beach transects. The 11-inch round coil weighs 1.03 pounds and delivers wider coverage than the 9-inch without the arm fatigue the larger 13 x 11-inch can cause during full-day hunts. All three coils share the same frequency range (4 to 45 kHz) and waterproof rating (20 meters).

The 11-inch FMF coil is waterproof to 20 meters (65 feet) and supports full submersion for saltwater surf hunting and river wading. The wireless design eliminates cable connections that can corrode in saltwater, and the coil-housed battery removes the need for a control-box harness in chest-deep water. The multi-frequency transmission adapts to shifting mineralization levels in wet sand and surf zones without manual rebalancing, and you can lock to a single frequency like 15 kHz for small gold chains in dry sand or run a multi-frequency program when working the wet-sand transition zone.

The 11-inch FMF coil delivers up to 20 hours of field runtime on a full charge. This overall battery life is highly variable and will depend directly on the specific factory program, discrimination filters, and frequency ranges you select on your control unit. Because the wireless design fully self-contains all electronics inside the waterproof frame, there are no external power cables to track. The battery recharges by connecting a dedicated charging cable directly to the integrated port on the coil housing. To review how simultaneous multi-frequency processing manages internal power efficiency, read our deep-dive on modern metal detector technologies.

The 11-inch FMF coil offers 49 selectable single frequencies from 4 to 45 kHz, plus simultaneous multi-frequency programs that transmit multiple frequencies at once. Lower frequencies like 4 to 8 kHz penetrate deeper and work well for high-conductor targets like silver and copper coins. Mid-range frequencies around 10 to 20 kHz balance depth and sensitivity for general-purpose hunting. Higher frequencies from 30 to 45 kHz maximize sensitivity to small low-conductor targets like gold jewelry and micro-relics. The multi-frequency programs cover the full spectrum in a single sweep, eliminating the need to swap frequencies when working mixed-target sites.

The 11-inch FMF coil ships with a lower pole, coil cover, hardware kit, and five-year parts and labor warranty. The lower pole is a stem section that connects the coil to the Deus II upper rod, and the hardware kit includes the reinforced plastic screws and spacers that secure the coil to the stem. You do not need to purchase a separate lower pole or hardware to mount the coil to your Deus II detector.

You can pair one FMF coil to your Deus II remote control and a second FMF coil to a pair of wireless headphones, giving you two ready configurations on a single machine. This setup is common among detectorists who hunt multiple site types in a single outing: pair the 11-inch coil to the remote for open-ground coverage and the 9-inch coil to the headphones for tight-space work, and switch between them without re-pairing. The wireless architecture allows you to maintain two different coil configurations simultaneously.

The 11-inch FMF coil covers the full 4-45 kHz spectrum, either as simultaneous multi-frequency programs or as one of 49 selectable single frequencies. You can switch between frequency modes without swapping hardware by selecting a different frequency or program on the remote control. The 4 to 45 kHz range covers low-conductor work like small gold and micro-jewelry, and high-conductor work like deep silver and copper coins, on a single coil. Lock to one frequency for surgical work on a known target type, or run one of the multi-frequency programs when you need wide spectral response across mixed targets in a single sweep.

Yes, a matching, durable factory coil cover comes fully included inside the box with your 11-inch FMF search coil. XP supplies this removable cover to shield the primary shell from scraping against abrasive gravel, rocks, and hard dirt. We strongly suggest keeping the cover properly installed during all field operations to prevent structural friction that could breach the outer housing over time. If your factory cover eventually wears thin or cracks after extensive seasons in the mud, you can find original replacements ready to ship inside our specialized round metal detector search coils collection.

XP regularly updates the system of their detectors to continuously improve performance. The 11-inch FMF coil is part of the Deus II wireless ecosystem and benefits from these ongoing improvements. Check the XP Metal Detectors website or subscribe to their newsletter to receive update notifications when new firmware becomes available. The manufacturer provides update resources and technical support through their official channels. Keeping your Deus II system current ensures you have access to the latest performance refinements and feature additions that XP releases for the platform.

The 11-inch FMF coil features a full five-year manufacturer warranty covering parts and labor against any internal defects in components or factory construction. The Deus II platform is formally certified with the LONGTIME European label, recognizing goods explicitly engineered for environmental durability and longevity. Purchasing your gear through an authorized dealer like Serious Detecting ensures your unique serial code is fully protected under factory service guidelines. For additional details regarding coverage parameters or specialized assistance, you can communicate directly with our trained customer care specialists anytime.