Do the Klein Tools RT105, RT110, RT210 Receptacle Testers require batteries?

The Klein Tools RT105,  RT110, and RT210 Receptacle Testers are Plug-in Receptacle testers for 120 Volt AC circuits ONLY!. 

These receptacle testers DO NOT require batteries.

They do require that the 120V AC receptacle being tested, be powered/live to work.