How big is the Cube?

Slightly smaller than 16 x 16 x 16 mm, the size of regular gaming and gambling dice.  Note, by the way, that 16mm cubed looks very different to, say, 19mm cubed. That's because it's actually only just over half the volume (0.59).  On the other hand, if you want a larger one, I am now making some in 20 x 20 x 20 mm - see the "larger dice" link in the menu.

How is it powered?

With a small lithium polymer battery contained within the Cube. This is not user-accessible (i.e. you can't take the Cube apart) but it is easily rechargeable.

I use another electronic mentalism product. I am worried that yours might interferere with it

I do not know the prototocols that all manufacturers use, but so far no problem has arisen, and I am confident to guarantee that it won't.

Also, note that the Cube does not use Bluetooth to pair with the receiver. This means that it will not turn up as one of the  available devices on Bluetooth menu on your smartphone, and more importantly it will not turn up on any curious tech-savvy spectator's. 

How is it switched on and off?

With a magnet, or, if you prefer, with a PK ring. A suitable magnet is included.

How long does a charge last?  

It can carry on transmitting for days. When you are not using it, you can put it into low power sleep mode. When you want to recharge, connect the holder/charger to any USB port and it will charge within 20 minutes, often much less.  If you could like to know more, I've written up a more detailed answer 

Will the audience hear the buzzer?  

No. The buzzer is quieter than a smart phone but in any case can be adjusted down to almost undetectable. 

How is the receiver powered?

It contains a rechargeable lithium polymer (LIPO) battery that connects to the holder/charger via a supplied cable

Is it inspectable?

Totally! There is no seam in the plastic version, and a virtually undetectable joint in the wooden ones, and nothing that shouts "electronics". I have even heard of suspicious spectators dropping electronic props in their drink to "test" them. The Cube will survive this, though I don't recommend it.  

Can you provide an ungimmicked die to match? 

Yes. Ungimmicked ones cost $3 each. 

Can you do them in different colors/colours? 

In principle, though a bespoke color, where I have to buy a new pigment, will be more expensive. Also, you probably not see the charging light shinging through the plastic.

What is included in the price?

Die, receiver, charging unit, charging cable, USB cable, and neodymium magnet. Just in case you missed it: you don' t need to buy the receiver separately! Also, three routines and full instructions via a webpage. 

What kind of warranty?

I offer a replacement service for the dice or replacement/repair for the other parts of 2 years. I made the first prototypes over two years ago and they are still going strong, so I am fairly confident the current ones will last longer

When can I get one?

Here! 

It's a big investment for me. Can you refer me to people who have bought the Cube so I can discuss it with them?

Yes I can, so long as the demand for referrals doesn't become overwhelming. I have several customers who have said they are willing to do this.