[电] combined listening&ringing key

tīng huàn zhèn líng hé yòng jiàn ㄊㄧㄥ ㄏㄨㄢˋ ㄓㄣˋ ㄌㄧㄥˊ ㄏㄜˊ ㄩㄥˋ ㄐㄧㄢˋ