where is the on-off switch?

The on-off is incorporated into the speed dial. Turn it and it clicks "on" and turn it further the speed will go up. Turn it the other direction and the speed will reduce and turned further will switch off.

Is there a replacement battery available and if so at what price?

This model don't use any batteries. You must have a special adapter (also from Proxxon) from 220 or 120 V to 12 V.

Can I use a universal 12V adaptor or I have to buy Proxxon brand? Is any power supply included?

I have not experimented with other power supplies, I can tell you the Proxxon power supply is 12 volt DC / 2 amp output.I can't tell you how much of that 2 amps the rotary tool uses under normal use. The label on my model 50E rotary tool states 18 volts DC max. and 40 watt power max.Other than being lighter and easier to handle for delicate work, a Dremel tool is what I use most of the time.

Is power supply is sold separately ?

Yes, you will need to purchase a Proxxon power supply. Either a 38706 Proxxon NG 2/S or 38704 Proxxon NG 5/E. You must use a Proxxon brand power supply otherwise the speed control not work.

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Proxxon 28512 12-Volt Micromot 50 EF Rotary Tool

Product ID: 334793030

Details

Brand
PROXXON
Colour
Green
Power Source
Corded
Recommended Uses For Product
Cutting
Voltage
12 Volts

⚡12V low-voltage power for safety

🔄5,000-20,000 RPM variable speed range

🛠️230g ultra-lightweight ergonomic design

Description

⚡ Power meets precision — your ultimate micro-tool companion!

VERSATILE MASTERY - Perfect for milling, engraving, polishing & more on any material
COMPACT YET MIGHTY - Portable 230g tool designed for professionals on the move
WHISPER QUIET POWER - Special magnet motor ensures vibration-free, silent operation
EXTENDED WORKFLOW READY - Efficient cooling system supports long, uninterrupted use
PRECISION AT YOUR FINGERTIPS - Pen-style 35mm diameter for ultimate control and comfort

The Proxxon 28512 Micromot 50 EF is a compact, lightweight 12V rotary tool delivering variable speeds from 5,000 to 20,000 RPM. Engineered for precision and comfort with a pen-style design and vibration-free motor, it excels in milling, engraving, polishing, and cutting across diverse materials. Ideal for professionals seeking quiet, ergonomic, and portable power tools for extended use.

Specifications

ASIN	B000S5KO3K
Best Sellers Rank	#264,867 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10,602 in Industrial Power Tools
Brand Name	PROXXON
Colour	Green
Customer Reviews	4.6 4.6 out of 5 stars (718)
Global Trade Identification Number	04006274285125
Included Components	bare-tool
Item Dimensions	29 x 16.5 x 4 Centimeters
Item Weight	0.79 Pounds
Manufacturer	Proxxon
Manufacturer Part Number	28512
Maximum Rotational Speed	20000 RPM
Minimum Speed	5000 RPM
Model Number	28512
Number of Batteries	1 Unknown batteries required.
Number of Items	1
Number of Packs	1
Other Special Features of the Product	Compact, Portable
Power Source	Corded
Recommended Uses For Product	Cutting, Engraving, Grinding, Polishing
Style Name	12-volt
UPC	785533786873
Voltage	12 Volts

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