There's something about blue... it's a beautiful color.  The solid Blue LED poi, in my opinion, are the most visually appealing version of LED poi.  They last for over 12 luminous hours on just three LR44 button cell batteries and come with batteries ready to go.  To turn the LED console on and off just turn the battery door clockwise and counter-clockwise, respectively.  To change the batteries simply turn the battery door counter-clockwise all the way.

The LED poi ball is about 2.5" in diameter and connected to finger straps with a 20" tether.  The pair weights about 6 oz so, they're a little lighter than other LED poi brands which allows them to have less force upon impact