Richway Continuity Loop Phone Set?- Black with Tic tracer AC voltage detector. Loop check electrician 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 6ft. Kinkless Test Leads 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***