Check the listing for details. Ecolink TX-E231 Wireless Door / Window Sensor 319.5 MHz. Condition: New. Listed at 31.99 USD. Ecolink TX-E231 Wireless Door / Window Sensor 319.5 MHz Advanced Security LLC offers UL Alarm Monitoring Services starting at $15.00 per month or DIY Self-Monitoring Services starting at $10.00 per month, NO Contracts, NO Hidden Fees, & NO Activations Fees. Message or visit our website We are an Authorized Alarm DC, Honeywell Home, Resideo, AlarmNet, Ecolink, DSC, Telguard, SecureNet, Uplink, Alula & 2GIG Security Dealer. We only sell Genuine Products, from authorized distributors . Not closeouts or old stock. Ecolink TX-E231 Wireless Door / Window Sensor. Back tamper, cover tamper. External contact design. Thin and small design that blends in with décor. Optimal wireless range for most residential or light commercial applications. Standard Features: Compatible with Qolsys/GE & Interlogix 319.5MHz wireless protocol Proven reliable wireless technology Back Tamper, Cover Tamper, Mounting Plate External contact input. 6" flying lead connection. Normally Closed 5/8" magnet gap Snap-on interchangeable brown case (included) Replaceable lithium battery (CR2032) 5-8 year battery life based on usage FCC and IC approved T he Ecolink brand is the manufacture of this product for Interlogix but now sells these under their own name since Interlogix has closed.. SAME PRODUCTS, just the packaging might be different. Ecolink TX-E231 Installation Guide Ecolink TX-E231 Data Sheet For more Ecolink products Click Here 782136724431