Philips AJ 3900 is a digital clock radio with alarm and sleep functions. It features a large, easy-to-read LCD display and simple, intuitive controls. The radio has a built-in FM tuner and can store up to 20 presets. The alarm can be set to wake you up to the radio or a buzzer, and the sleep function lets you fall asleep to the radio and have it turn off automatically after a set period of time. The AJ 3900 also has a CD/line in jack, so you can connect it to your MP3 player or other audio device.