HP 40G manual Operating details, Batteries, Operating temperature 0 to 45C 32 to 113F

menu	A choice of options given in the display.
	It can appear as a list or as a set of menu-
	key labels across the bottom of the
	display.
menu keys	The top row of keys. Their operations
	depend on the current context. The
	labels along the bottom of the display
	show the current meanings.
note	Text that you write in the Notepad or in
	the Note view for a specific aplet.
program	A reusable set of instructions that you
	record using the Program editor.
sketch	A drawing that you make in the Sketch
	view for a specific aplet.
variable	The name of a number, list, matrix, note,
	or672?graphic that is stored in memory. Use
	to store and use >9$56@ to retrieve.
vector	A one-dimensional array of values
	separated by commas (periods if the
	Decimal Mark is Comma) and enclosed
	in single brackets. Created and
	manipulated by the Matrix catalog and
	editor.
views	The possible contexts for an aplet: Plot,
	Plot Setup, Numeric, Numeric Setup,
	Symbolic, Symbolic Setup, Sketch,
	Note, and special views like split
	screens.

Operating details

Operating temperature: 0° to 45°C (32° to 113°F).

Storage temperature: –20 ° to 65°C (–4 ° to 149°F).

Operating and storage humidity: 90% relative humidity at 40°C (104°F) maximum. Avoid getting the calculator wet.

Battery operates at 4.5V dc, 60mA maximum.

Batteries

When battery power is low, the ((•)) annunciator stays on, even when the calculator is off. There is also a warning

Reference information R-7