1)wireless doo rbell with hearing aid. 2)Frequency: 1800-1900 MHz 3)For the aged. 4) ... CE 5) Water proof with IP65 wireless door bell with hearing aid, CL-6011 Technical Specifications1. CE (EMC LVD TBR6)2. Standard ... a call incoming even on Mute status7,Hearing Aid speaker, easy use for senior people8,High quality intercom with communication (range: Indoor 35~50 ...