A voice-controlled vehicle. A shape-shifting probe designed to squeeze inside aircraft. A blood-suctioning surgical assistant ...

Although the Bolt and Bolt Plus look more or less the same — a waterproof plastic sphere with a rolling robot inside — the new version upgrades the original Bolt’s limited 8 x 8 LED matrix ...

The robot will eventually sell for $1,499, but Amazon is offering an introductory price of $999, which includes a 1-year subscription to Ring Home Protect Pro home security service.