The AVA GTS Wireless Pen is an all-in-one powerhouse for both Tattoo Artist & PMU Artist. With 3 different operation modes: Classic Voltage, SMP Frequency, & SMP Torque. This pen offers 7 different stroke adjustment (2.0–4.5 mm), a Bluetooth foot pedal, 2 replaceable 18500 lithium-ion battery , and a vivid 1.48″ HD screen. CNC-machined aircraft-grade aluminum housing ensures rock-solid reliability, while fully customizable options let you tailor everything from firmware to finish. • Triple Operation System: Classic Voltage, SMP Frequency(1–20 NPS), & SMP Torque(1–40 mN·m) • Adjustable 7 Stroke: 2.0, 2.5, 2.9, 3.3, 3.7, 4.1, & 4.5 mm • Includes two interchangeable grips in 38mm and 30mm sizes. A simple twist of the grip allows for easy adjustment of needle protrusion • Bluetooth Wireless Foot Pedal • 2pcs rechargable 18500 Li-ion Battery with 7-hour battery life • Simple Three-Button Operation • 1.48″ HD Color Screen • CNC-Machined Aircraft-Grade Aluminum . What's Included: GTS Pen, two batteries with charger, two grip sizes, Bluetooth foot pedal, machine bag, travel case, and a rubber screen cover