The BOSS Effect - Katana Air Amp is a totally wireless guitar amplifier with newly developed BOSS technology delivering rock-solid sound with ultra-low latency. Compact wireless transmitter plugs into various kinds of electric guitars and charges while docked in the amp. The transmitter provides 12 hours of playing time on a single charge and automatically enters standby mode to conserve the charge when no activity is detected. Premium tones derived from the Katana stage amplifier series, with five unique amp characters and access to over 50 world-class BOSS effects. Amplifier powered by included AC adapter, or go completely wireless with eight AA-size batteries.