Sonic Alert is a popular company that makes flashing alerts for the home. Generally these use lamps that plug into their modules.  They do have strobe lights too. Very nice cost-effective way to cover every room in your house or building.

(SA-SS12V Vibrator) Notification Devices Sonic Alert Super Shaker 12V Bed Shaker Sonic Alert Super Shaker Bed Vibrator. The powerful vibrations are guaranteed to wake up even the heaviest sleeper. Uses a 12 VDC plug. Black fits only the Black Sonic Boom Alarm clock. White fits only the White Sonic Boom Alarm clock.   MSRP: $29.95 Your Price: $27.95 Qty: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Choose color Black White

(SA-BL-300) Notification Devices Sonic Blink The Sonic Blink, is a receiver that features a built-in, high intensity strobe light for signaling. No need to use a lamp!. MSRP: $49.95 Your Price: $47.00 Qty: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

(SA-USS-360) Notification Devices Universal Sound Signaler Sonic Alert Sound Signaler. The USS360 Universal Sound Signaler with a lighted switch, "pluglet" & new design is a full functioning desktop signaler. The USS360 will alert you to any important sound - phone, telephone, kitchen timer, baby, smoke alarm, etc. This device will alert you by flashing a lamp or light "ON and OFF" that is plugged into its "pluglet" as well as semd a signal in other rooms where Sonic Alert remote receivers are located. MSRP: $49.95 Your Price: $47.95 Qty: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20