General power of attorney is issued only in written form, oral form has no legal force.
General power of attorney is not considered valid, unless the date of issuance.
If the power of attorney on behalf of a legal entity, it must be certified by the signature and seal of the head. Mandatory notarization by a notary for legal entities is applicable only to those powers of attorney which are given out on the basis of substitution. In other cases, certify to only those powers of attorney which are given out to individuals. But as practice shows it is better to assure any power of attorney.
Those powers which you assign to the Trustee is necessary in great detail to paint.
It is best to specify in the text of the power of attorney passport data Trustee.
Be sure to specify in the General power of attorney right of substitution.
If suddenly the head was replaced, then you need to immediately replace a power of attorney signed by the old Director, power of attorney, signed by new.
The term power of attorney it is best to specify, but the maximum it can be done only for three years, in the future it will have to do it again. If you period is not indicated, then the power of attorney will still be valid, but only within one year from the date of signature.