Can I set this to silent, while still having the shaker function on? I don't want to disturb my neighbors, but need the shaker option. Thanks!

Yes! Use the shaker and flashing lights. The lights wake me up just before the shaker goes off. I'm so hard of hearing ( the reason I bought this ) that I don't hear the alarm, but everybody in the house does.

Will the shaker work effectively with a SleepNumber or other similar air mattress?

I bought this for my 16 year old son who sleeps 'like the dead'. I had SO much trouble getting him up for school and/or work. He actually doesn't put the 'shaker' part under his pillow or mattress....he lets it dangle down the nightstand. It causes suck a ruckus clanking and rattling against the night stand I can hear it from the other end of the house! It has worked for him 100%. He's up every morning, without fail. And he had a summer job that started at 7am......he wasn't late even once!

does it have two alarms?

Sadly, the one disappointment in this clock is that although there are two alarm options, they both have to be set to the same MODE. (To select the wake up mode, slide the “Alarm Mode Switch“ to your desired position: a) “BUZZ“ for sound b) “VIB“ for bed shaker c) “VIB/ BUZZ“ for both sound and bed shaker NOTE: once the wake up mode is chosen, this will apply to both alarms.) We feel that being able to have the vibrating as an initial wake up and a loud buzz as the second, would be very useful, but not possible on this model.

ASIN	B000OOWZUK
Additional Features	Dual Time feature.
Alarm Clock	Yes
Batteries are Included	No
Best Sellers Rank	#4,710 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #30 in Alarm Clocks
Brand	Sonic Alert
Brand Name	Sonic Alert
Clock Form	Travel
Color	Black & Red
Customer Reviews	4.5 out of 5 stars 36,730 Reviews
Dial Color	black
Display Type	Digital
Frame Material	Plastic
Included Components	Power Supply, Powerful Bed Shaker, User Guide
Indoor Outdoor Usage	Indoor
Item Dimensions W x H	5.5"W x 5.5"H
Item Type Name	Sonic Alert Sonic Bomb Alarm Clock With Super Shaker
Item Weight	0.6 Kilograms
Manufacturer	Sonic Alert
Manufacturer Part Number	SBB500SS
Manufacturer Warranty Description	1 year parts, 1 year labor.
Material Type	Plastic
Model Number	SBB500SS
Mounting Type	Flush
Number of Batteries	1 9V batteries required.
Number of Items	1
Operation Mode	Electrical
Power Source	Corded Electric
Product Dimensions	5.5"W x 5.5"H
Room Type	Bedroom
Shape	Semicircular
Size	5.5 inches (W) x 5.5 inches (H) x 3 inches (D)
Special Feature	Dual Time feature.
Style	Classic
Style Name	Classic
Unit Count	1.0 Count
Warranty Type	Extended
Watch Movement	Automatic

Sonic Bomb Dual Extra Loud Alarm Clock with Bed Shaker, Black | Sonic Alert Vibrating Alarm Clock Heavy Sleepers, Battery Backup | Wake with a Shake

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