Leszek does a quick presentation of the Advanced Tracer Units II and III from Specna Arms in this Gunfire video... "Quick presentation of new Specna Arms silencers - ATU™ (Advanced Tracer Unit). The new silencers are available in two length options, ATU™ II is 130mm long, and ATU™ III is 150mm long and in two color versions (black and tan). Both are made of aluminum on CNC machines and have a universal 14mm CCW thread. Advanced Tracer Units offer a tracer function and suppression of the sound of the shot thanks to damping inserts inside the case. Due to high-power LEDs located on both sides of the BB inlet, the silencer very effectively illuminates green tracer ammunition. The ATU™ has a built-in lithium battery that provides 4 hours of operation and can be charged via a USB cable. The tracer effect will allow you to make your night or indoor airsoft games more thrilling."