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The primary difference is the BC™ 30 Wireless Backup Camera is hardwired to constant power or the reverse lights similar to traditional factory installed reverse cameras, and the BC™ 40 Wireless Backup Camera runs on lithium ion batteries for a completely wireless solution. Please view a comparison chat and compatibility list for both at the following link: https://support.garmin.com/en-US/?faq=bl7aRUlG1719d1KM2acL68&productID=591686&tab=topics&topicTag=region_compatibility
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