GPK Systems&reg; 65W Car Adapter for Asus Transformer Book Flip TP500LA TP500LN TP550LD Input: 11V-16V DC 5.6A Output: 19V 3.42A 65Watt. Connector Size: 5.5 x 2.5 Service & Support 1 year warranty Designed exclusively for use with the laptops 100% compatibility with the original Replacement power supply Car power adapter was tested to match and/or exceed original product at low price.