Digital LCD Expanded Scale Voltmeter (ESV). 500 mah to 1500 mah (.5A to 1.5A) load. Up to 20V input. Pefect for Li-Ion/Poly, Nicad, or NIMH packs. Black button supplies a 500 mah load, Red button is 1 amp load, and both supply a 1.5 Amp load. Easy to read LCD display. No load on the battery is displayed when just plugged in. The best ESV you'll ever own. Includes Futaba J wire, works with Futaba, JR/Hitec, Spektrum and Airtronics Z systems.