FEATURES: Xcortech X3300W Advanced BB Control System Shoot Chronograph. Standard Airsoft 14mm(-) negative threaded tracer. Made from high quality aluminum. High efficiency circuit. Digital display with brightness controls, can be mounted onto standard 20mm / Picatinny / Weaver rail. Power saving / standby / and auto power off modes available. Measures ROF (RPM). Programmable BB counter to count down or count up. Low ammo warning. Battery indicator for real time monitoring of battery level. Low battery warning. Programmable burst unit (2-10 burst / full auto). SCU 8 channel memory. Devices communicate via wireless signal. DETAILS: Xcortech model no. - X3300W BK Colour - Tan Weight - Tracer (140g), PEQ Control Box (70g) Barrel Thread Type - Counter-Clockwise Barrel Thread Diameter - 14mm Power - Tracer (AAA battery x 4), PEQ Control Box (AA battery x 2) (batteries not included) Dimensions - Tracer (156mm x 37mm), PEQ Control Box (110mm x 70mm x 31mm)