TEST-UM TG100 Multi-Function Tone Generator with Alligator Clips Generates As Much As 700% More Power Than Standard Tone Generators Constant Tone Amplitude Over Life Of The Battery Gives Accurate & Traceable Tones, Even At The End Of Battery Life 2 Tone Amplitude Levels (Normal & Half) Lets Users Extend The Tone Reach Auto-Off Protects The Battery Life Tone May Be Added To Any Mode For Using Phone Sets Without Monitor Mode