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Perhaps one of the most popular kinds of alarm clocks is the radio alarm. They typically have all the normal features of an alarm clock but will also have a radio built in that would either be FM radio or DAB radio, most modern radio alarms have DAB radio, radio alarms are also commonly known as dual alarm clocks as well.
Radio alarms normally have a digital display, which is either LCD or LED, and they are normally mains powered with a backup battery incase the mains power is disrupted. The radio alarm display being digital will normally have a 12hour or 24hour time format, and most have other displays such as date, alarm status, pm/am. The radio element of the clock will have a vast amount of radio stations so you can tune into your favourite station.
In recent years people are favouring dab radio alarms as this modern technology has many advantages over FM and AM radio. DAB (Digital Audio Broadcasting) digital radio is a new way of broadcasting radio, in addition to FM analogue transmission, via a network of terrestrial transmitters. It provides listeners with more choices and information delivered in clear and crackle-free sound quality. The technology allows the receiver to lock on to the strongest signal it can find. With DAB digital stations there are no frequencies to remember, and sets are tuned by station name, so there is no retuning on the move.
As well as DAB radio, modern radio alarms are also adding a number of innovative features such as Ipod docking stations, MP3 players, they also act as chargers for your favourite MPS player. All radio alarms have speaker so you can listen to radio but many of the top end models have large speakers so the quality of the sound can be heard more effectively. 
The full range of radio alarms includes:
DAB radio alarms
Dual radio alarms
Ipod radio alarms
Digital radio alarms
LCD radio alarms
FM radio alarms
Radio alarm clock
MP3 radio alarm
An example of a fully featured radio alarm is this Philips radio alarm
Rise and shine with clear and crackle-free DAB radio This Philips Clock radio has an elegant mirror-finish display and wakes you up to your favourite radio station. It even lets you preset two alarm times to wake up at different times.
Radio alarm Product Description
Get your day going with crackle-free DAB radio. This Philips Clock radio has an elegant mirror-finish display and wakes you up to your favourite radio station. It even lets you preset two alarm times to wake up at different times.
The backup battery operates with a CR2025 battery (not included).
Accessories included are the AC-DC Mains Adapter, User Manual, Warranty certificate, Quick start guide.
Wake up to the radio or a buzzer
Wake up to sounds from your favourite radio station or a buzzer. Simply set the alarm on your Philips Clock radio to wake you with the radio station you last listened to or choose to wake up with a buzzer sound
DAB and FM compatible
DAB (Digital Audio Broadcasting) digital radio is a new way of broadcasting radio, in addition to FM analogue transmission, via a network of terrestrial transmitters. It provides listeners with more choices and information delivered in clear, crackle-free sound quality.
MP3 Link
The MP3 link connectivity allows direct playback of MP3 content from portable media players.