FK iron flux max BLACK 4mm stealth 2 battery's

Stroke Options:4.0 mm Comfortable, Durable Design: 7.23 oz. (205g) Dynamic Power Path Management: Get reliable, consistent power levels. OLED Digital Display: Easily read battery life, change settings and voltage. Responsive eGive Settings: Easily choose from three levels of eGive setting for maximum control. Built-In Time Tracker: Track time during sessions directly on your machine. Changing Voltage: Choose your voltage down to the decimal point and now view in hertz for improved accuracy. Wireless Connection: Get a greater range of Bluetooth connectivity and full compatibility with existing FK Irons wireless devices. *Compatible with FK Irons Killswitch* Detachable battery: Includes new PowerBolt II & compatible with existing PowerBolt and PowerBolt+ batteries. Battery life: Up to 10 hours of battery. Full charge as quickly as 2 hours when used with included USB-C charging cable. USB-C port: For best results, use USB-C charging cord that comes with your Flux Max. Bluetooth capability: Pair with Darklab app for firmware updates Voltage: 4-12 Volts (Reaching new lows with 4V) Grip: 38 mm Engineered & manufactured in the USA