The Trillium Wireless Tattoo Pen with Digital Display Control Built-in battery with Digital Display Control. Lasts up to 8 hours with a 2-hour charging time. Suitable for versatile tattooing needs with the Trillium Wireless Tattoo Pen. 5 Grips Included - 1.1" inch aluminum grip, 1.25" inch aluminum grip, 1.35" inch aluminum grip, 1.25" Inch rubber handle grip, & 1.35" Inch rubber handle grip. Only the aluminum grips are autoclavable. Built-in Battery - 5-8 hour run time depending on work load. It takes 2 hours for a full charge. Pen Material - Aircraft aluminum. Motor - MATSU B5 Motor. Voltage - 5 to 12 Volts. Digital Display - 1st light shows voltage (e.g., 85 = 8.5 volts). 2nd light shows battery life (e.g., 75 = 75% battery life). 3rd light shows working time (e.g., 125 = 125 min). Needle Swing - 3.5mm Swing, adjustable with a twist of the grip. Pen Connection - RCA connection. Power Cord - RCA cord included. Weight and Length - 6oz and 5.5" inch.