Comet Original CAA-500 MARK II Standing Wave Analyzer 1.8-500MHz SWR & Impedance Simultaneously Range: 1.8  500MHz (including 222MHz band). RF output level: 0dBm 1 mW. Measured SWR Range: Analog meter 1.0  6.0:1 , LCD display 1.0  9.9:1 Impedance measurements: 12.5-300 ohms. Reactance range: 0  500 Ohms (absolute value) 1.8 -190MHz. Battery indicator and selectable Auto-Power-Off timer Operates up to 9 hours continuous using six AA Alkaline or NiMH cells (not included). or use an external 8-16VDC 200ma power source (DC cable included) Internal trickle charger option when using NiMH batteries Size: 3.5 x 7.75 x 2.65 inches (overall) Weight: 2lbs 2oz with alkaline batteries installed