Does it work on course black hair?

Yes it does, my hair texture meets your description. I believe it would be classified as type 4C. I like this product, it easy to use. The only negative is the placement of the power button.

Is it safe to use on wigs?

On human hair wigs, yes. Synthetic absolutely not. Hope it helps.

how to use? Is the light on all the time?

Dear, Thank you for your question.Glad to be able to serve you. Please watch the video, there are detailed instructions in the video. Thank you for your support and understanding. If you have any questions, please feel free to contact us. Have a nice day :) Sincerely NICEMOVIC

How long does take for the hot comb to heat up? is it heat enough?

Dear, Thank you for your question. Glad to be able to serve you. NICEMOVIC hot comb is different from others, it can be heated quickly within 20-30 seconds, quickly and safely straighten rough and curly hair/beard/wig, make it shiny, silky, long-lasting, without damaging the hair. Thank you for your support and understanding. If you have any questions, please feel free to contact us. Have a nice day :) Sincerely NICEMOVIC

Manufacturer	NICEMOVIC
Item model number	1
Package Dimensions	34.11 x 7.11 x 5.21 cm; 281 g
ASIN	B0989KK98Z

Hot Comb Electric Heating Comb, NICEMOVIC Ceramic Heat Pressing Comb Brush Hair Straightener Hot Comb, Curling Hair Straightening Comb for Natural Black Hair Beard Wigs(Gold)

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