B40 series is made for customization, with beautiful appearance。A glass-filled nylon housing with expoxy-encapsulated electronics provide exceptional durability and protection against moisture, dust and vibration。 You could decide what the voltage and output will be, or intelligent one that measures the ambient noise level and adjust their output level, or vocal version even your own voice. Sealed in expoxy for protection against dust, mositure and vibration Voltage polarity protection easy to install, and many optional connectors/wire 

RoHS compliant， CE certified 

Size:129*74*69mm

Weight: 355g

Models of B40 series back-up alarm:

Mechanical drawing (mm)：

Wires/connectors optional:

Sound sample(s):

B40 beep sound.mp3