Sphero BOLT

Sphero Bolt
Sphero Bolt is a transparent version of the Sphero robot, with a diameter of 73 millimetres (2.9 in) and weighs 200 grams (0.44 lb). It is sealed and has an inductive charger. This model has the most sensors of the various Sphero robots, including motor encoders, gyroscope, accelerometer, 8x8 LED matrix display, compass, infrared, and light sensors.

It is a upgraded version of SPRK+.