According to OPS-Store, the Poseidon's Theseus Medusa ETU PDW Tracer is a compact airsoft replica packed with high-end features. It includes an integrated Acetech Tracer that works with both red and green BBs, and its Medusa ETU is programmable via Bluetooth and a mobile app. This allows you to customize firing modes and pre-cocking, and also gives you access to built-in diagnostics. With a V2 gearbox, 8mm bearings, and a quick-change spring, this model is designed for advanced performance.