Sku: R718J2-AS923

Availability: Many In Stock
Sku: R718J2-AS923

Netvox wireless 2-Input dry contact sensors - R718J2 can be used to detect contact between two wired contact points. This sensor can be used with an external mechanical switch or a contact plate to alert the user via APP when the contacts touch or a switch is triggered

Principle of Operation

The device can be connected to dry contact devices, such as various switches, buttons, and output of the reed switch. It can detect the closing or disconnecting signal of the dry contact. It uses the SX1276 wireless communication module. 

Example Applications

  • Tamper switches
  • Barn door access monitoring
  • Freezer / cooler door access
  • Freezer / cooler doors (to determine if they are not closed all the way
  • Convenience store cooler doors (to determine if they are not closed all the way)
  • Forklift seat switches
  • Dry contact sensor  

Features of NETVOX Sensors

• Wireless range of 10 km *
• LoRaWANTM Class A compatible
• Frequency Hopping Spread Spectrum (FHSS)
• Improved interference immunity
• Improved power management for longer battery life
• Encrypt-RF™ Security (Diffie-Hellman Key Exchange + AES-128 CBC for sensor data messages)
• Battery Life* :
5 years (Conditions: ambient temperature 25 °C, 20 triggers/day, txpower = 20dBm, LoRa spreading factor SF = 10)
• Over-the-air updates (future)
• Third-Party online wireless sensor monitoring and notification system to configure sensors, view data and set alerts via SMS text and email (optional)
• Available third-party platform: Actility/ThingPark, TTN, MyDevices/Cayenne
• R718X series carry magnets which can be attached to ferromagnetic materials and objects
*Actual range may vary depending on environment.
*Battery life is determined by sensor reporting frequency and other variables


Technical Specifications


Input Power 2 x 3.6V ER14505 AA lithium batteries
Sleeping Mode 22uA
Wake up Mode 6.3mA @ 3.3V
Low Voltage Threshold 3.2V
Tx Current 120mA/3.0V
Rx Current 11mA @3.0V


External Wire Specification 

Wire material

UL2547 28AWG

Wire maximum temperature


Maximum outer diameter of the wire


Wire length


Wire flame resistance rating





Tx Power 19dBm±1dBm
Rx Sensitivity -136dBm (LoRa,Spreading Factor=12,Bit Rate=293bps ) -121dBm (FSK,Frequency deviation=5kHz, Bit Rate=1.2kbps)
Antenna Type Build-in antenna
Communication Range Build-in antenna
Data Transfer Rate 0.3kbps~50kbps
Spread Technique   LoRa/FSK
Available Frequency   EU863-870,US902-928,AU915-928, KR920-923,AS923,CN470-510 Configured before shipment


ADC Sampling Characteristic

ADC Sampling Voltage Range



12 digits

ADC Conversion Rate

1.14 Msps

External Cable Length








Operating Temperature

-40℃ ~ 55℃

Environment Humidity Range

<90% RH (No condensation)

Storage Temperature

-40℃ ~ 85℃




User manual:


Battery Calculator: 

Netvox Battery Calculator 

Netvox LoRa Command Resolver: 

LoRa Command Resolver

R718J2 - Netvox LoRaWan Wireless 2-Input Dry Contact Interface

Sku: R718J2-AS923

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