Fans for the Notepal; 3 fans, 1 connection.
I have Notepal W2 with 3 fans, it's ideal for my 17.3" and 15.6" notebooks. After more than 5 years of constant use one of 3 fans started making funny noises and kept rattling. It's great you can order new ones - plus the delivery was very quick.
I have two Notepal with 3 fans and they are ideal for may 17" notebooks. After more than 4 year, I just changed fans and they work as new.