A cochlear implant system comprising a first unit adapted to be worn on or in one ear of an implantee. The segmented digital to analog converter disclosed here features, in particular, inherent monotonicity and low transition glitches. Then, a degree of reliability of the search results is determined in consideration of at least one evaluation variable, and the search results are provided to the user according to the determined degree of reliability. When the top cover is assembled to the back frame, the second sidewall leans closely against the first sidewall, and the first body is opposite to the second body. The first sub-radiating member is substantially triangular, and the second sub-radiating portion is substantially parallel to the ground.