Announcing a new kit release this July. Mongoose is a small robot chassis with features normally found in much more expensive kits.
differential drive hardware PWM
754410 H-Bridge dual optical rotation sensors (108x transitions per rotation) PIC18F2525 or PIC16F886 brain programming & debugger support (via Inchworm ICD2 connector) LCD / USER connector (breadboard) additional front mounted PCB options (line followers, whiskers, sonar etc...) Tamiya Gearbox, 58mm wheels & ball caster.
4xAA NiMH batteries required.
See
formatting link
for more info and info including 3D drawings.