Model KTH15 Max input DC voltage DC66V Max input circuit Current 60mA Max input bell stream voltage 105v Max input bell stream circuit current 120mA Weight (kg) 3.8kg Communication Distance â?¤10km,model: MHYV1*2*7/0.37 Bell ringing level â?¥95dB Material ABS Protection Level IP65 Installation Wall Mounting/Table Linker coupler KTA12 coupler T/P Way Tone and Pulse Function Explosion proof /waterproof/ anti noise -