Absolutely thrilled when this first came, especially when i'm primarily working from a laptop (which doesnt have the numpad). Didn't want to buy a fullsized keybaord as that would be a hassle to lug around and this fits the bill perfectly as it is able to be slipped into the laptop bag (along with the bluetooth mouse). Speaking of bluetooth - was really impressed that it had bluetooth functionality thereby freeing my USB port for other devices.
In terms of power management (device is powered by an AAA battery which is supplied) device goes into sleep mode a minute or two of inactivity. Waking it up from sleep requires a tap on any key on the num pad and waiting for several seconds, the computer would display a connected icon. BRILLIANT!
a downside of this product is that it is NOT working in combination with the laptop's main keyboard i.e. if you required to hold down shift (on the laptop keyboard) and simulteneously pressing a numpad key it is NOT possible. The programs which i'm using are audio edditing programs which require such combinations.
on a whole, a cracking product.