With the ability to adjust the siren volume level, this weather alert radio is the ultimate companion for receiving emergency alerts. Weather alert radio uses S.A.M.E. technology (Specific Area Message Encoding) that pre-programs the device to receive only those warnings that apply to your local area. You can choose state, county and/or nearby counties. The single-speaker radio offers 23 programmable county codes, AM/FM tuning, date, time, alarm functions and automatically switches from AM/FM to pertinent all-hazard alerts. For tuning, the radio employs drift-free PLL (phase-lock loop) technology and an easy-to-read blue, backlit LCD. You'll also get the convenient, 10-alert memory that lets you add, edit and remove unwanted alerts at any time. The radio uses the supplied AC power adapter or four AA batteries (sold separately).