Key Features:

• Enables Two-Way Wireless: Adds support for ELK’s two-way wireless sensors (902–928 MHz) – e.g. keyfobs with status LED, supervised motion sensors with walk-test LED, etc. 
  
• Up to 144 Wireless Zones: Each transceiver can handle 144 wireless sensor zones, matching the M1’s wireless zone capacity. Multiple transceivers can be strategically placed to cover large areas
  
• Multiple Transceivers: Supports up to 4 M1XRFTWM units on one control for redundancy and greater coverage (they collaborate to prevent interference). Ideal for mansions or outbuildings
  
• Secure Frequency Hopping: Utilizes spread-spectrum 902–928 MHz with frequency hopping for reliable, jam-resistant communication. Two-way communication ensures sensors confirm command execution (e.g., arming from keyfob provides visual feedback)
• LED Status Indicators: Onboard LEDs show Status, Valid, and RF signal activity for easy troubleshooting of wireless communications (signal, enroll status, etc.)

Technical Specifications:

• Frequency: 902–928 MHz frequency hopping spread spectrum (North America)
  
• Wireless Zones: 144 per transceiver; supports all ELK two-way models (pet-immune PIRs, keyfobs, smoke/heat, glassbreak, etc.)
  
• Data Bus: 4-wire RS-485 (powered by panel’s aux 12V). Draws ~25 mA when idle, ~85 mA on transmissions
  
• Antenna: External whip antenna (included) attaches via terminal block (ANT, GND) – should be positioned vertically for best range
• Mounting: PCB with mounting holes; can be housed in ELK enclosure or any structured can. Dimensions ~ 3.5″ x 2.75″. Operating temperature 0–120 °F