DB453B - Calculator AURORA - Free user manual and instructions

Product Type	Desktop Calculator
Brand	Aurora
Model	DB453B
Display	12-digit LCD with punctuation
Power Source	Solar cell with LR44 battery backup
Key Functions	Addition, subtraction, multiplication, division, percentage, square root, memory (M+, M-, MR, MC)
Dimensions (W x D x H)	150 mm x 120 mm x 30 mm
Weight	110 g
Material	Plastic body with rubber keys
Battery Type	LR44 (1.5V) button cell
Auto Power Off	Yes, after approximately 7 minutes of inactivity
Operating Temperature	0°C to 40°C
Cleaning	Wipe with a soft, dry cloth. Do not use solvents.
Safety Precautions	Avoid exposure to water, extreme temperatures, and dropping.
Spare Parts Availability	Not available; device is non-repairable
Warranty	1 year limited warranty
Certifications	CE, RoHS

Frequently Asked Questions - DB453B AURORA

How do I replace the battery in my Aurora DB453B calculator?

Slide the battery cover off on the back, remove the old LR44 battery, and insert a new one with the positive (+) side facing up. Replace the cover.

Why is my calculator display dim or not showing numbers?

The solar cell may be in low light. Move to a brighter area or replace the backup battery if the display is weak even under good light.

How do I use the memory functions (M+, M-, MR, MC)?

Press M+ to add the current number to memory, M- to subtract, MR to recall the stored value, and MC to clear memory.

What does the auto power off feature do?

The calculator automatically turns off after about 7 minutes of no key presses to save battery. Press ON/AC to turn it back on.

How do I calculate a percentage?

Enter the number, press the % key. For example, 200 × 10 % gives 20.

What is the square root function and how do I use it?

To find the square root, enter the number and press the √ key. For example, 9 √ = 3.

How should I clean my calculator?

Wipe the exterior with a soft, dry cloth. Do not use liquid cleaners, abrasives, or immerse in water.

Is the calculator suitable for heavy usage in an office?

Yes, it is designed for general office use with a durable keypad and reliable solar/battery power.

What should I do if the keys become sticky or unresponsive?

First, check for dirt or debris. Clean gently with a dry cloth. If still unresponsive, the device may need replacement as it is not repairable.

Where can I download the user manual?

The manual is available for free download in PDF format from the notice-facile.com website or other online manual databases.

USER MANUAL DB453B AURORA

PROBLEM	INPUT	DISPLAY
Tax rate set (e.g. 17.5%)	175	17.5
	RATE	17.5 RATE
	TAX+	17.5 TAX%
Recall tax rate	RATE	0 RATE
	TAX-	17.5 TAX%
Add the Tax Amount	120	120
Price £120 without tax	TAX+	141 TAX+
Price with tax-?(£141)	TAX+	21 TAX
Tax-?(£21)
Subtract the Tax Amount	141	141
Selling price with tax £141	TAX-	120 TAX-
Price without tax=? (£120)	TAX-	21 TAX
Tax=? (£21)
100÷(1−20%)=125	100÷20MU	125
2+3−1=4	ONCO22+3−1=	4
−2.4×6÷8=-1.8	2·4×6÷8=	−1.8
2×(3+4)−5=9	3+4×2−5=	9
3×2.54=7.62	2ONCO3×2·54=	7.62
2+3=5	2+3=	5
4+3=7	4=	7
2−3=-1	2−3=	−1
4−3=1	4=	1
2×3=6	2×3=	6
2×4=8	4=	8
2÷4=0.5	2÷4=	0.5
3÷4=0.75	3=	0.75
2+3+3=8	2+3=	8
6−2−2=2	6−2=	2
2^3 =8	2×=	8
20×25%=5	20×25%	5
5÷20%=25	5÷20%	25
20×(1+15%)=23	20+15%	23
20×(1−20%)=16	20−20%	16
2×3=6	2×3M+	M 6
−)3×4=12	3×4M-	M 12
+)4×5=20	4×5M+	M 20
14	ME	M 14
	ME	14