Craftsman vs. Black & Decker Cordless Li-Ion Screw Driver

Craftsman 4 volt Cordless Lithium-Ion Screwdriver with Case and 20 pc. Bit Set

http://www.sears.com/shc/s/p_10153_12605_00911398000P?vName=Tools&cName=Portable+Power+Tools&sName=Power+Screwdrivers+%26+Screwguns

Price $39.99

Features a 2-speed gearbox, a 1/4-inch quick-release hex collet chuck and integrated LED worklight, this cordless screwdriver from Craftsman has the power and features to get the job done. Includes charger, bits and case. Wt. 3.25 lbs.
4.0 volt lithium-ion battery pack provides power and longer run time
Two-speed gears (200 rpm / 600 rpm) allow you to match speed to job application
1/4 in. quick release collet accepts standard nut/screwdriver bits
Adjustable (24-position) Torque Clutch allows selection of proper driving torque needed for various jobs
Automatic Spindle Lock automatically locks collet to allow manual tightening if batteries are not sufficiently charged
Integrated Worklight provides direct light source to work area

Black & Decker VPX1101X Li-Ion VPX 7-volt Screw Driver

http://www.amazon.com/Black-Decker-VPX1101X-Li-Ion-7-volt/dp/B000UMJJ3C

Price $24.99

2-speed transmission: 0-195/0-650 rpm
1/4-inch hex shank Quick Connect collar
7-volt operation with one VPX Li-Ion battery (included)
Weighs 2.6 pounds