how many hours before recharge

It doesn't recharge. There's no battery inside the e-file. It must be plugged in to operate it but it can be plugged in to any USB power source, even those back-up battery packs to charge your phone on the go. It's 5Volt 1Amp so any US power source will work.

Can I use this sanding bit on natural nail? to buff?

you can but on the lowest setting. The other tools are probably perfer on natural nails. If you use the sanding run it against a nail file to get rid of the sharp edges.

Do you have replacement bits to buy when these go dull?

Most drill bits fit it I buy mine frome shein

It says it’s “usb.” does that mean it’s cordless, and charges by usb, or would i be stuck with a short usb cord? what type of usb is it? thanks!

Dear customer, The drill is not a battery drill. It needs to plug to work. For basic use, follow these simple steps Step 1: Plug in your chosen drill bit. Step 2: Connect the power cord with the nail drill handpiece and the other end with the USB interface. Step 3: Control the Forward/OFF/Reverse button in the middle of the cord to turn on/off or change the rotation direction. Step 4: Control the SPEED SWITCH in the middle of the cord to adjust speed. Please contact MelodySusie Amazon Support via below link: https://www.amazon.com/hz/help/contact/A24IL96TV4XLBY?marketplaceID=ATVPDKIKX0DER&sellerID=A24IL96TV4XLBY&_encoding=UTF8&ref_=v_sp_contact_seller& Or contact us via service@melodysusie.com if you have any problem or concerns, we will gladly get back to you and assist. Thank you!

Manufacturer	MelodySusie
Package dimensions	15.4 x 10.5 x 5.8 centimetres
Package Weight	0.24 Kilograms
Item dimensions L x W x H	26 x 16 x 10 centimetres
Item weight	480 Grams
Brand	MelodySusie
Colour	Gray
Item model number	PC180G
Product Dimensions	26 x 16 x 10 cm; 480 g
ASIN	B086X69K8Y

MelodySusie Nail Drill

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