Each stick has a Bluetooth accelerometer that detects when you hit in midair. The accelerometer is wireless and battery powered. Simply pair the sticks to the iPad.
The iPad receives data from the sticks and plays the appropriate sound sample. The iPad also detects bass drum stomps via the microphone and emulates the bass drum.
Traditional drumsets are loud and expensive and electric drumsets take up space. You can use Airdrums with headphones and also with little physical space.
No more buying new drum heads or accesories. Drum sounds are easily customizable so you can have multiple kits. Airdrum's hardware is also inexpensive.