Richway Continuity Loop Phone Set️- (Blue) All Electricians, Instrument Techs, Automotive Techs, Maintenance workers, etc, should have our high quality, professionally made continuity tester phones in your tool bag! 12v internal battery and carrying bag included! Features: Soldered joints, High quality parts and craftsmanship 12v battery included, Nice carrying bag, Multiple color choices, hook & loop straps to secure wire leads, On/Off switch, Bright LED indicator light, 1 year warranty, Customer support -DO NOT USE ON LIVE CIRCUITS