Instruction: Evaluate each product title in the given list, assess its relevance to the given query, and then arrange the products in descending order of relevance, with the most relevant product at the top of the ranked list.

Input:
Query: pthtechus watch
Product list:
A: 4G Smart Watch for Kids - WiFi GPS Smartwatch Phone Waterproof Touch Screen Digital Wrist Watch with Call Voice Video Chat Pedometer Fitness Tracker Alarm Clock for Boys Girls (Blue)
B: Funntech Smart Watch for Android Phones with Pedometer Unlocked 2G GSM Phone Call 1.54 Inch Touchscreen Camera for Kids Men Women
Answer: A,B