What replacement batteries do I need for my system?

Keypad 8 x 1.5V AA (LR6) Alkaline
Battery Siren 4 x 1.5V D (LR20) Alkaline
Solar Siren 1 x 6V 2100mAH NiMH
Door window contact detector 1 x 3V CR2032 Lithium
PIR Movement Detector 3 x 1.5V AAA (LR03) Alkaline
Remote Control 1 x 3V CR2032 Lithium

For AA, AAA & D type batteries, it is recommended to use alkaline type batteries, because this type has a more stable voltage, and lasts longer than the lower cost zinc-carbon type. For an approximately 10% increase in battery life, you can also use Lithium batteries.