Both built-in sounds and option for external sound input via SDcard (MP3) have 30 built-in sounds Able to avoid signal confusion with a variety of tone options Can prevent cross talk of different voice environments by selecting an audio signal fit for the specific environment and condition Offers both Binary and Bit input mode options with 30 pre-recorded sounds Binary input mode has built-in 30 messages that can be played with switch for sound selection Bit input mode is organized into 6 groups of 5 sound tones for a total of 30 sound tone options. Playback can be selected from one of the 5 tones in each group (MP3 file with bit input mode) Volume adjustment and sound selection switches located inside the unit SDcard type can play MP3 voice messages, user can select and change the sound message after record it Sound volume : Max 98dB at 1m Materials : Housing-ABS, Cover-ABS Ambient operating temperature : -25°C to +50°C Protection rating : IP54 Certificates : CE Compliant, UL Listed Compliant with RoHS directive
