The classic Grothe two-tone gong with its sound plates made of real bell steel reliably ensures a clear and rich tone when signaling. Conventional technology of the highest quality and maximum durability. The 8-12V gongs can be operated via a transformer. The 230V versions include a transformer or are connected directly.Product features:Classic two-tone gong and two-tone with repetition (continuous tone) electromechanical sound plates made of real bell steel white recommended transformer: GT 3148Technical data:8-12V~ (4VA) max. 85 dB (A) short-term load max. 20 s (KB 20s) 169 x 104 x 49 mmClock frequency continuous tone approx. 2 - 3 HzInstallation instructions:Note: