I paid $3.99 for this just to compare it to KillAWatt. After leaving my Frig plugged into WANF for 24days I can't figure out what it recorded. For Cost, it doesn't say whether it's recorded cost/minute, per day, per hour, per month OR WHAT!! For Consumption, it appears to record instantaneous and accumulated KWH, but it doesn't SAY what it recorded. To me the WANF unit isn't worth $4 I paid for it. The User Manual is so poorly worded it will do nothing but confuse you, so if you buy this unit you're on your own. However the KillAWatt 4460 unit tells me exactly what it's displaying in dollars/minute, per hour, per day, per month, per year and in Volts, Amps, Watts, KWH, both instantaneous and accumulated. Both WANF and KillAWatt retain data when unplugged, so you can repower them at your desk to read the data.
========Original 4star Review below is Updated above========
Very detailed User Manual, but painfully short on usable information. It's almost impossible to understand what the abbreviations are, so taking a reading for power consumption or cost per day/week/month is a real challenge.
Other than that, it's great.
The backlighting alone puts it head and shoulders above KillAWatt. When you're standing on your head in the first place trying to read these things in the outlet 12" above the floor, you don't want to have to hold a flashlight in order to see the display.
Can't figure out how to contact the manufacturer, but they say "we have set the price very low in hope that customers will consider to try this product and leave review feedback". I bought it on the cheap and like it, but it's really hard to use. Hope they read this because I'd be grateful if the maker would contact me, and send a better User Manual.