B20 series car back-up alarm is one of most popular and cost effective lines. A glass-filled nylon housing with expxy-encapsulated electronics provide exceptional durability and protection against moisture, dust and vibration. Intelligent models measure the ambient noise level and adjust their output level. create a volume that is safe without being annoying or contributing to noise pollution. Vocal or white noise versions are optional. 

reinforced nylon housing eliminates corrosion damage 

wire/connector/bolt mounting optional, easy to install 

Voltage polarity protection 

RoHS compliant， CE certified 

Size:103.5*71*40.5mm

Weight: 310g

Models of B20 series back-up alarm:

Mechanical drawing (mm)：

Wires/connectors optional:

Sound sample(s):

B20 beep sound.mp3                B20 white sound.mp3