It's a chrono and tracer unit from Acetech that Geonox Airsoft gets to review in this video... "Here we look at the Blaster Tracer and the AC6000BT Chrono from Acetech. What is special about the Blaster Tracer are its 3 modes. There is the normal tracer function. Then there are the simulated flames. And the third mode is Tracer plus Flames.

The AC6000BT is easy to use. The readings are accurate and you can connect the whole thing to your cell phone via Bluetooth."