high voltage usually means (around here) 5V & up. warmer vapor, etc. as described by other answers. if it's a high volt
mod it typically means a vaporizer that uses standard batteries--the type of batteries you'd use in electronics other than e-cigs, i mean.
for suppliers and types... there are lots and lots. search "silver bullet", "chuck", "protegy", "xhaler"... that'll give you plenty to start with for research.
