The OMNITRONIC EM-105 is an echo module designed as a replacement part or extension for the W.A.M.S.-05 PA system. It provides two adjustable microphone inputs on 6.3 mm jacks, with echo effects generated by an integrated effects processor. The number of repeats and delay time can be adjusted. The module operates on 12 V DC, has a 70–16,000 Hz frequency range, measures 19.1 × 42.5 × 6.8 cm, and weighs 0.22 kg.