I believe this to be the best dedicated 16340 charger on the market. It is tiny and charges via USB. (Some packages ship with a wall adapter also.) With a charging output of 250 mA your 16340s are well pampered. The 3.0v option is really handy. I use it to charge my Tenergy and AW LiFePo4s. The green and red LED indicators are screaming bright, so you aren’t going to forget your charger is at work. Each bay charges independently. If you like 16340 Li ion, this charger is a must have.