what is the meaning of this sentence and when do you use it?
what is the meaning of this sentence and when do you use it?
詳細はお気軽にお問い合わせください

Question

what is the meaning of this sentence and when do you use it?
what is the meaning of this sentence and when do you use it? 
詳細はお気軽にお問い合わせください

Answer

Feel free to contact me for any questions （you may have）.

This phrase will be added the end of mail or Email in the outlets, the shops, etc.

Answer

thank you very much for your help ^____^

Answer

This phrase is used at end of letter. The meaning is "Do not hesitate to contact me for anything.".