Astro Products Rechargeable Hobby Router

Used only once.
The cardboard backing of the package is partially torn.
Hoping someone can use it.

Retail price: ￥2,519 (tax included)
Description from Astro Products HP:

This is a compact and lightweight rechargeable router.
Since it does not require a power source, it can be used anywhere.
Its pen shape is easy to grip and provides good workability, making it suitable for fine polishing and grinding work on model crafts, small plastic parts, and small components.
The rotation speed can be adjusted in 3 stages to suit the task.
Includes grinding stones and diamond bits.

Product Specifications
Main unit size: L146×W31×D31mm
Weight: 93g
Speed adjustment: 3 stages
No-load speed: 5000, 9000, 14000 min-1
Collet size: Φ2.35mm
Rated operating time: 15 minutes
Usable time: Approx. 80 minutes
Built-in battery: Lithium-ion battery
Battery voltage: 3.6V
Battery capacity: 600mAh
Charging time: Approx. 2 hours
USB charging cable length: Approx. 590mm
Main unit functions: Overload protection, overcharge protection, over-discharge protection
Material: ABS (main unit)
Accessories: USB cable, tree-shaped grinding stone, cylindrical grinding stone, ball-shaped diamond bit, cylindrical diamond bit