This was originally a gift from Toyota The model is: cotci-dt601, each weighs 18.8 grams. It's very convenient to hang on the key, and the size is very small. Because this may be a gift, the market has not seen that other houses are selling it. After selling it, there will be no more goods. Buy one to hang on the key (check each iron ring on the chain closely before hanging it to see if there is a gap, and look for tools to pinch it closely to avoid losing it) in the long distance Or when it's hot, it's very convenient.