This high-tech bluetooth wireless footswitch is for the Bergantino B|Amp to switch between two memory slots on the amp, as well as expand the amp to have a third memory slot and enter a mute function to engage the tuner. All you need to do is plug the included USB dongle into your B|Amp USB port, turn on the footswitch and you are ready to go! No more cables or power supplies needed to switch between your favorite presets in your B|Amp. - Lithium ion (CR2032) battery provides 6-12 months of use -Second spare battery included in battery compartment -LED to signal low battery and Bluetooth connection status -Bluetooth 4.0 low energy radio Transmit power: 0 dBm TX peak current: 18.2 mA Frequency -2.402GHz to 2480GHz Approximate Range: 33 feet (10 Meters) – sub. to orientation and other factors