If you need help, you want a big button you can easily press without it being fiddly and an extremely loud alert.
Like this 100db cordless help alarm.
Place by a sick bed, the toilet or in the bathroom, wherever a quick call for help may be needed.
At 9 x 9 cm, 3.5 x 3.5 inches it makes a very portable alarm.
Push that button and a noise like being a metre away from a pneumatic drill, or a speaker at a teen dance or chain saw is let off.
Most people should hear that, even if downstairs.
Remarkably this cordless help alarm is powered by a simple 9v battery (not included).