Meh.I really wanted to like Zook, I did. I was impressed by the toy, but it's just not strong enough. I wouldn't be complaining as much about not being able to thrust the toy if the clitoral attachment worked well for me, but without a motor in the arm it doesn't feel like much of anything.
It's rechargeable, splash-proof, and travel friendly.
I would say that this toy is splash-proof, and wouldn't submerge it underwater.
The silicone coating doesn't provide as much drag as other silicone toys I have (Fun Factory's Tiger comes to mind.) It's similar to Lelo Gigi, with a tiny bit more drag.
Insertable length: 3 1/2"
Diameter: 1 1/4"
I wouldn't submerge this and I haven't had a chance to use it in the shower, but before taking it in the shower I would recommend making sure the charging port is sealed.
Zini's Zook has a three button interface consisting of a (+) (-) and (o) button.
When you first get your toy it will be charged but travel locked. To unlock your toy hold the (+) and (-) button (this is seriously the hardest part! I hate unlocking/locking this toy) when the LED lights blink green that means it's unlocked and if they blink red you've locked it, or it's still locked. You might want to practice locking and unlocking because it's hard to master.
The (+) button is used to turn on your toy and raise the intensity of vibrations (there are 5 levels of intensity.) You can also hold the (+) button for two seconds to get to the highest level of intensity. The (-) button lowers the intensity. To turn the toy off you hold down the (-) and (o) buttons simultaneously for 5 seconds. The (o) button is used to switch between pattern mode and vibration mode, when in pattern mode you can use the (+) and (-) buttons to cycle through 15 different patterns. Also if you hold (o) down for two seconds it will cycle through all 15 patterns for 3 seconds each, which is pretty awesome.
You can also check the charge of the toy by holding down the (o) button when the toy is off. The LED lights color will show the charge left on the battery, Green is 100%-95%, green-yellow 95%-70%, yellow 70%-50%, orange 50%-10%, and red is 10%-0%.