Plug in Alarm System Transformer for your Security System Input voltage: 120 VAC, 60Hz; Output voltage: 24V, 40VA ,No-load output voltage: 26.6V,SAFE AND STABLE auto-resetting (PTC) fused secondary, LED green power indicator Easy to install: screw down and thread clamps to electrical box Powers thermostats and doorbells: replace underpowered transformers This 24 V transformer fits for Honeywell and Sensi smart thermostats; Nest, Ecobee,Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation EPLZON 24V 40VA Plug in Thermostat and Doorbell Transformer

Specification:
Input voltage: 120 VAC, 60Hz
Output voltage: 24V, 40 VA

Solve Problem:
🔧No more doorbell or thermostat underpower hassel
24V 40VA Plug in transformer, replaces and upgrades underpowered transformer with this 24V AC transformer, offering plenty of power for your thermostats and doorbells.

Safe and stable:
Auto-resetting (PTC) fused secondary
LED green power indicator
Positive/negative/ground screw terminals

Note:
The brand above is only for demonstrating compatibility