Features:Anti-interference and noise-free function.Two-way voice intercom communications technology, automatic identification of processing speech signals during a call does not require any action.Dedicated anti-side tone processing chip, with auto-mute function.Application of completely automated call control, outside the machine's microphone and speakers to use the integration of design and front-line system of the host to connect, easy installation.Inside and outside the two-way voice signal output(recording by the bank teller), a stereo jack output mode can prevent voice recording function controlled by the power switch and the function buttons.Application: bank, securities, hospital, bus station Where guard glass again theft is installed.Specifications:Condition:100 percent Brand NewColor: As shown in the pictureMaximum operating current: 1AMain sound (sub sound): 3WInside microphone: -42db Outside microphone: -42db Package List:1 x Dual-way Counter Walkie Talkie1 x External Speaker1 x 12V Power Supply2 x Adhesive1 x Instruction Manual.