Check the listing for details. Loop Check Phones™ Continuity Test Electrician Phones™ ES001-NR. Condition: New. Listed at 114.99 USD. ES001-NR is the base modelAdd-on options are: ES001-NR5 has 5 feet extra-long leads, ES001-NRM has 2 super strong magnets and the ES001-NR5M has it ALL, 5 feet extra-long leads and 2 super strong magnets. Professionally made with the highest quality new parts, 100% ready to use right out of the bag and designed for professional electrical workers to check for continuity and loop check. Made for electricians to work on non-energized single and multi-conductor cables no matter how long they are. Simply clip one phone on each end of the wire to check continuity. Communicate two people loud and clear, no noise or interference. All sets include heavy-duty push-button LED light on/off switch (that lets you know when continuity is complete), internal battery, velcro ties to secure kink-less wire leads, and a heavy-duty tool storage bag.**WARNING/CAUTION/DANGER**Do NOT use on LIVE circuits or energized wires of any voltage. Misuse may result in serious injury or death. We are NOT responsible for any misuse that leads to personal injury, property damage, damage to the phones or any other equipment of any kind.