Black smart panel,cool design,strong function,two way alarm,detector failure report,strong voice prompt,unique design for ... choice. Main System Features1) New intelligent recognizing failed detectors,with suitable voice recognition such as control panel keyboard operation, remote ... optional)5) Receiving distance : outdoor<150m; indoor: 30~60m6) Weight: 1kg 7) Size: 235mm (L)*165mm(W)*35mm(H)Remote ...