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Patented design clamps covered with non-conducting rubber, Twice grip design for better conductivity and tension. The design of the protector enables real-time monitoring of the connection status, providing short-circuit protection, polarity anti-reverse connection protection, and indicating connection errors through a red indicator light. CCA(Copper Coated Aluminum) high density pure copper for easy electrical conductivity and power transfer. Low temperature immunity (-25C/-13F), it will work well in the extreme environment,and it is only applicable to small vehicles. Don't worry about the warranty. Cartman's aim is to give you the best shopping experience.