Bunnell also took the antenna connector port from a defective Airport card in order to boost signal strength, since replacing the bottom case would trap the wireless signal. Once finished, Bunnell states that the modification yields speeds of around 1400 to 1700Kb per second, a slight speed decrease from around 2000Kb per second when the device was an external dongle. Uploads lowered slightly from 500Kb per second, to around 380Kb per second. Users interested in this modification should be advised that opening up a non-consumer serviceable computer will void the warranty. Connecting additional devices to the MacBook Air's USB port could also inhibit usage of the dedicated USB Superdrive, due to its increased voltage requirements and proprietary nature of the Air's USB port.