Key Features:

• Invisible Installation: Recessed mount design – installs inside the door and frame so the sensor is hidden from view. Preserves the aesthetics of doors, a must for decorative or front doors
  
• Two-Way Wireless Supervision: Communicates via Elk’s two-way wireless – ensuring strong range and allowing the system to supervise and check sensor status actively. Tamper switch on the sensor will alert if it’s popped out of the hole
  
• For Wood/Vinyl Doors: Intended for non-metal doors and frames (wood, fiberglass, vinyl) – drilling a 3/4″ hole. Not recommended for metal doors as that could interfere with the RF signal and fit
  
• Long-Life Battery: Uses a 3.6V lithium battery (1/2 AA) for multi-year operation. Even though it’s hidden, the panel will notify when the battery is low so you can retrieve and replace it
  
• Color-Matched: Comes in white or brown versions, so when the sensor is installed, the visible cap (flange) at the hole’s edge can match the surface – practically disappearing into the frame
  

Technical Specifications:

• Frequency: 902–928 MHz (Elk two-way). Fully encrypted, low-latency communication with Alarm Engine. Up to 128 zones supported by the panel, and up to 5 of these receivers (AERF3 for one-way or AERF9 for two-way) can be used for coverage
  
• Detection: Magnetic reed switch, closed loop.
• Operating gap: Approximately 5/8″ (16 mm) between magnet and sensor for reliable closure detection (magnet and sensor should align when door is closed)
  
• Battery: One 3.6V 1/2AA lithium (e.g., Tadiran TL-2150 or Saft LS14250).
• Battery Life: ~5–6 years typical. The sensor transmits low-battery to panel for maintenance
  
• Dimensions: Sensor: 0.75″ diameter × 2.5″ length; Magnet: 0.75″ diameter × ~0.625″ length (fits flush in matching 3/4″ hole). Sensor has an integrated flange for a neat finish on the hole edge
• Mounting Requirements: Drill 3/4″ hole in door edge and frame so they align when closed. Depth: sensor 2.5″ into frame, magnet ~1.5″ into door.
• Includes: sensor, magnet, and instructions. (If the door/frame is metal, consider surface sensor instead due to RF attenuation)