A cordless telephone or portable telephone is a telephone with a wireless handset that communicates via radio waves with a base station connected to a fixed telephone line, usually within a limited range of its base station

The advertised battery life on most models is different from the real-world achievable life. For example, the fifth generation 30 GB iPod is advertised as having up to 14 hours of music playback.

A battery is a device that converts chemical energy directly to electrical energy.

The cordless handset is powered by a rechargeable battery, which is charged when the handset sits in its cradle.

Some cordless phones advertised as 5.8 GHz actually transmit from ... utilize two rechargeable AA or AAA batteries

Duracell manufactures alkaline batteries in many common sizes, such as AAA, AA, C, D, and 9V. Lesser used sizes such as AAAA (primarily for pagers, penlights, and blood glucose meters) and J size batteries (for hospital devices) are also manufactured along with a range of "button" batteries using Zinc-air chemistry, used in calculators, hearing aids, and other small (mostly medical related) devices. Duracell began selling Dane-Elec products such as flash memory in 2008

We specialize in Wireless Outdoor Speakers made by Audio Unlimited and other quality manufacturers that provide excellent audio and durability at affordable prices. Wireless Home Speakers, especially Rock Speakers and other Outdoor Wireless Speaker Systems allow you to enjoy music or TV on your deck, patio or in your yard, without the hassle of running long wires or digging up your yard or house during installation.