Loop Check/Continuity Test Phones- Purple ightening Bolt Continuity Test Phones All Electricians, Instrument Techs, Automotive Techs, Maintenance workers, etc, should have our high quality, professionally made continuity test phones in your tool bag! 12v internal battery and carrying bag included! Features: Soldered joints High quality parts and craftsmanship 12v internal battery included Nice carrying bag included Multiple color choices Velcro straps to secure wire leads On/off switch Bright LED indicator light 1 year warranty Extended warranty available Customer support ***DO NOT USE ON LIVE CIRCUITS***