How toy Star Wars droid works
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If you’re lucky enough to own the hottest toy of the season, the Sphero
BB-8 droid, you’re probably wondering how it works. Here’s how

Head: Attaches to sphere by magnets
Drive wheels
SIDE VIEW

Counterweight: Helps hold BB-8 drive wheels down

High-density polycarbonate shell: 4mm thick, slightly opaque, waterproof

Bluetooth antenna: Connects to smartphone. Large, to give range of 30m

Drive wheels

Inductive charging: Electromagnetic field transfers energy to battery

Charging station

Stability: Unpowered upper wheels

Circuit board: Includes gyroscope to aid orientation and flashing LED lights

Induction charging coil

Two electric motors: These power two drive wheels independently, allowing them to turn in different directions and make BB-8 rotate

Smartphone app: Control BB-8 using iOS or Android smartphone app. Drive him with one finger or let him roam about autonomously

Cost: $149.95
Top speed: 7.2km/h (4.5 mph)
Battery charge: Over 1 hour on full charge
Height: 11.4cm   Width: 7.3cm   Weight: 200g
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Sources: Sphero, Tested, uBreakiFix, Wired, starwars.com
Picture: Lucasfilm Ltd