I bought a bluetooth earphone but it got ~1 sec delay which is annoying all the time except when listening to music.
What wireless technologies do you recommend instead of bluetooth? (which can be connected to my notebook)
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The pros (and many amateurs) us wireless in-ear monitoring systems.
They are available in a range of prices from USD 200 or less up to thousands of dollars depending on features and sound quality.
Some major manufacturers include Shure, Sennheiser, and Audio-Technica, all of which are equally respected for their microphones and headphones.
In my experience the latency is more from a lower powered notebook so a different connection, even wireless IEMs might not fix it.
If you have no noticeable latency with a wired connection then they do make cheaper RF headphone adapters that you plug into the headphone jack. (I sometimes use them when mixing from my iPad)
The best way to be able to monitor your playing is to get an interface with a direct output and connect your headphones to that.