Benefits

As per labor law; salary, indemnity and potentially, un-utilized earned leave. Most companies also give a one-way ticket to home country if you cancel your visa and leave Bahrain - nothing if you don't.

Beyond that, it is determined by the policy of each company and the level / circumstances you leave them on.  As an example, I was in top management and representing the company officially with every government agency.  When I left, they gave me the standard benefits as per labor law plus 8 months salary in lieu of confidentiality / non-solicitation / non compete clauses, allowed me to vest my stock options and kept my health insurance / visa for a year.  No ticket or moving costs as I wasn't leaving Bahrain.

sick leave is not include ?

and the amount that will you receive is base on your basic salary.?

No, encashment is only for un-utilized annual leave.  And that is on basic salary.

alright, my case is i don't have offer letter when i start my 1st day at work, they just say this is your salary (verbal), i start working then after 2weeks, they give me 1 paper that i need to sign, OFFER LETTER all include there overtime, allowance etc, but the salary there is only 25% of my salary that i receiving from them monthly, they said its only for a GOSI that's why its not the same on your salary, to be follow your contract, but until now they did not give me any contract. I try to request but they refused.

I'm thinking after i finish my contract how much i will get from them, only 25% of my Salary because that the contract that i sign ?

Whatever contact is registered with authorities is what will be applied.

just to confirm is un-utilized annual leave pay different from indemnity pay?

Yes, it is different.

If you used all of your annual leave, and therefore have zero un-utilized, this component would be zero.

You are still entitled to indemnity pay, which an end-of-service award, based on length of service, with its own calculation and terms. You can find details of this in other threads in this forum or the official websites.