Different though they may be, these two systems have a lot in common. Both are made from matte-finished silver metal with glossy white and clear plastic, housing 15-hour rechargeable batteries, and connecting via mini-USB ports to included white plastic wall chargers. Though TravelSound for iPod nano is a little larger, measuring roughly 2.25” wide and 0.88” thick to i50’s 1.75” wide and half-inch thick body, it’s around…