For Samsung Rugby A837 Premium Travel Plug-in Car Charger This unit was built with strong thicker cord to ensure better durability over time. Comes with Intelligent Chip 34063 (Prevents overcharging and overheating). IC Chip recognizes a full battery & automatically switches to saver mode. Can be used with input voltages from 12V to 24V DC (both car & truck). Comes with LED charging indicator.