The Klein Tools ET310TRANS is a replacement Transmitter for the ET310 Circuit Breaker Finder. The ET310 consists of two parts; a Transmitter which is connected to the electrical outlet/circuit and the Receiver which is used to scan the breakers in the panel. The Transmitter features an integrated GFCI Outlet Tester to check for wiring faults.Warnings Before each use, verify tester operation by testing on a known live and correctly wired receptacle and circuit. Tester is intended for indoor use only. The tester is designed for use with 120V AC electrical systems. DO NOT connect to higher voltage electrical supplies. Read, understand, and follow all warnings and instructions before operating testers. DO NOT use if the tester appears damaged in any way. Always consult a qualified electrician to resolve wiring problems. If using accessories to connect to bare wires ensure that the circuit is not energized before inspecting, applying, or removing the transmitter. Features Built to withstand a 6.6-Foot (2 m) drop The Transmitter may be connected to other electrical fixtures using optional accessories which are sold separately (Cat. No. 69411) Transmitter incorporates a GFCI tester for tripping GFCI devices The ET310 consists of two parts: a Transmitter connected to the electrical outlet or fixture, and a Receiver used to scan the panel to locate the correct breaker The Transmitter also checks for common wiring faults in North American grounded electrical outlets Transmitter is a replacement part for the ET310 Circuit Breaker Finder with Integrated GFCI Outlet Tester CAT II 120V safety rating Transmitter is powered by the circuit when connected to the electrical outlet or fixture; no batteries needed Integrated GFCI Outlet Tester; No Batteries Needed Voltage: 120V AC Safety Rating: CAT II 120V Depth: 3.99 in Overall Height: 4 in (10.2 cm) Overall Length: 2 in (5.9 cm) Overall Width: 1.4 in (3.6 cm) Height: 1.41 in Width: 2.01 in Weight: 0.146 lbs Material: ABS and Electrical Components DownloadsVideo DownloadSpec SheetInstructionsET310-INSTRUCTIONS_WEB.pdf