The plastic dongle plugs in-between an outlet and a device, and leverages a database of electricity prices based on location and time of day to calculate how much an appliance drains from your wallet per hour, day, week, month and year.

ENGADGET: Insert Coin: MeterPlug estimates electricity costs per device, aims to save you some cash

Plug the second adapter into another power outlet and connect the adapter to a network device.

ENGADGET: Amped Wireless' PLA2 super power-line adapters are available from today

The device can be plugged into a wall outlet or battery powered.

FORBES: Cancer-Fighting Electric Hat Proves We Live In The Future

Embedded inside it is a batteryless RF switch, and the way it works is that upon the release of the spring mechanism inside, a tiny bit of power is generated for the 2.4GHz RF transmission ( ZigBee compatible), and whatever device is connected to the RF control outlet on the other end will receive the on or off signal.

ENGADGET: Mitsumi exhibits micro-vibration power generator and batteryless RF switch (video)

Convenient Pass-Through Mode - Both Joey and the user's device can be charged from a single wall outlet cable.

ENGADGET: Timbuk2 Power Commute carries your gadgets, keeps 'em charged for $199 (hands-on)

Tragically, the micro-USB charging port is located on the upper left side of the phone, which is an incredibly awkward place when you're trying to use the device whilst it's chained to an outlet.

ENGADGET: Huawei Ascend G526 hands-on: a midrange 4.5-inch LTE handset

Medis' initial Power Pack is designed to be a "socket in your pocket" that will allow cell phone and handheld-device users to recharge their gadgets without plugging into an outlet.

FORBES: Fuel Cell Firm Guns For Military Money

The 20W box will play audio streamed from any AirPlay-capable device on the same WiFi network while it sits demurely on a wall outlet.

ENGADGET: JBL SoundFly Air ships, delivers AirPlay to your wall socket for $199

The device is portable and can be powered with batteries or plugged into an electrical outlet.

ENGADGET: Portable brain tumor treatment system kills cancer while you take out the trash