Instruction: Answer yes if the product is a substitute for the query and no otherwise.

Input:
Query: iphone 6 self charge case
Product: Feob Battery Case for iPhone 8/7, HI8P67B2 Upgraded 6000mAh Rechargeable Portable Charger Case Extended Battery Pack for Apple iPhone 8 & iPhone 7 Protective Charging Case (4.7 inch)- Black
Answer: yes