Found this hair trimmer and I think it checks out lots of boxes:
- Cordless,
- Waterproof,
- Li-ion battery,
- USB charging
- Plenty of accessories,
- Great reviews.
- Under $20
https://www.amazon.com/dp/B06XDC47Q6
Price:$25.99
Coupon Code:TR3EC8HI
Total: $19.75