Simply plug any device into Watt's Up and the meter instantaneously displays the wattage being used, as well as 18 other values, including average monthly cost. The device records this data into non-volatile memory (stored even if power is lost). One thousand seven hundred data points are stored, starting with a sampling rate resolution of one second. It records any power interruptions, which is extremely handy when performing an audit of several devices. Watt's Up is also capable of real-time logging. It even includes a payback calculator software utility, which automatically calculates the time required for a new energy efficient appliance to pay for itself! Features

• USB interface
• True RMS power measured and displayed
• Can store 1700 complete records (over 32,000 if just recording watts)
• User selectable logging interval
• Records Power factor, Min/Max voltage, Min/Max current, RMS voltage, RMS current, average monthly cost and more
• Software automatically graphs all recorded data and includes an integrated analysis tool
• 120 VAC, 60 Hz, 15 Amps (UL Listed)
• Dual frequency 50/60 Hz
• 6 foot power cord 120 VAC, 60 Hz, 15 amps continuous
• Rate can be entered from $0.001 to $2.00 per kilowatt hour, in tenths of a penny
• Dimensions: 7" x 4" x 2" (18cm x 10cm x 5cm)
• Weight: 1.5 lbs (0.7 kg)
• Watts up? is UL listed to standard 3111-1
• Indoor use only