Sonic Boom SBT425ss review
Built-in Telephone Signaler
Use a phone 2 to 1 adapter (splitter)
Extra Loud Pulsating audio alarm, at least 92dB
Packaged with Sonic Alert's newest most powerful 12 volt bed shaker
Complete with a hi/low dimmer switch to sleep better at night.
Built-in flashing lights alert you to the telephone ringing and wake-up alarm
9 volt Battery