1. 7 Pin Wiring Circuit Tester2. Designed to indicate a failure in the wiring on both towing vehicles and trailers/caravans etc3. Just plug the tester in the 7 pin socket or the 7 pin plug of the trailer or caravan and press the yellow button on the side of the tester4. With a 6 light LED system5. All the LEDs light up when the wiring is good6. Makes the checking of the wiring quick, easy and very simple7. Durable black plastic construction8. Portable, easy to store hand held designSpecification:Voltage 12VSize: approx. 20 x 6 x 4 cm/7.9 x 2.4 x 1.6inchPackage included:1 x Wiring Circuit Tester (9V battery is NOT included)Note:1. Please allow a bit error due to manual measurement. please make sure you do not mind before you bid.2. The color may have different as the difference display, pls understand.