Is this all I need to monitor an additional circuit? Or do I need a sensor too?

You will need a sensor too. If you are monitoring a sub panel you will need 2 sensors

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Efergy Elite / E2 / Transmitter

Product ID: 734550365

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Details

Brand
Efergy
Color
white
Plug Format
Type A or Type
UPC
743724503548
Power Source
Solar

⚡solar-powered transmitter

📡150 ft wireless range

🔄real-time updates every 10-20 sec

Description

📡 Stay ahead with real-time energy intel—because every watt counts!

ECO FRIENDLY POWER - Solar-powered design means zero battery hassle
COMPACT LIGHTWEIGHT - Sleek 68g transmitter fits discreetly anywhere
REAL TIME ENERGY TRACKING - Updates every 10, 15, or 20 seconds for instant feedback
SEAMLESS WIRELESS FREEDOM - 150 feet transmission range keeps your data flowing effortlessly
EXPAND YOUR ENERGY INSIGHT - Add up to 5 transmitters for comprehensive monitoring

The Efergy Elite / E2 Transmitter is a solar-powered wireless device that extends your existing Efergy energy monitoring system. It supports up to 5 transmitters, offers a robust 150-foot transmission range, and delivers real-time energy data updates every 10 to 20 seconds, empowering you to optimize energy use with precision and ease.

Specifications

Brand	Efergy
Model Number	STEXTRa
Package Dimensions	10.16 x 7.62 x 5.08 cm; 68 g
Color	white
Power Source	Solar
Are Batteries Included	No
Item Weight	68 g

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