The ZXT-600 is a replacment to the ZXT-120, where same features but is now z-wave plus chipset.
The ZXT-120 is a Z-Wave to air-conditioner (AC) IR Extender and it works with z-wave controllers by translating Z-Wave’s Thermostat commands to AC IR control code.
Users can set the IR code from the built-in code library of ZXT-600 through the configuration commands, or use the learning function of ZXT-600 through the UI on the gateway. ZXT-600 also has a builtin temperature sensor that allows it to report your room temperature to the home gateway.
Supports nearly all models of heat pumps supplied in New Zealand. For units not supported a manual configuration can be done.
Battery required: 2 x AA (Sold seperatly)
Full manfacture info here: https://www.remotec.com.hk/bw8490-product-page/