The BOSS KTN-50 is a popular 50-watt, 1x12-inch modeling guitar amplifier in the Katana series, known for its versatile tones, built-in effects, and dynamic feel that is suitable for practice and small gigs. 
The BOSS Katana-50 offers a range of professional-grade features and specifications for a variety of playing styles and situations. 
Output Power    50 W (switchable to 25 W, and 0.5 W for low-volume practice).
Speaker    12-inch (30 cm) custom speaker.
Amp Types    Five core amp characters (Acoustic, Clean, Crunch, Lead, Brown) plus a "Pushed" variation on Gen 3 models.
Effects    Five simultaneous effects categories (Booster, Mod, FX, Delay, Reverb) with three variations each, providing access to 15 unique effects directly on the panel. Over 60 customizable effects are available via the BOSS Tone Studio software.
Tone Settings    Four memory slots for storing and recalling complete amp and effect setups (CH1, CH2, plus a Panel setting).
Connectivity    1/4-inch input jack, 1/8-inch Aux In jack, stereo 1/4-inch phones/recording output with mic'd cabinet emulation, USB connectivity for recording and Tone Studio editing, and inputs for optional footswitches (sold separately). The Gen 3 models use USB-C.
Dimensions & Weight    470 (W) x 238 (D) x 398 (H) mm (18-9/16 x 9-3/8 x 15-11/16 inches). 11.6 kg (25 lbs 10 oz).