Features: 1) The substation is thin and compact, while the appearance is handsome 2) Easy to install, there is only one wire for master station and substation connection 3) The volume of master station and substation can be adjusted separately 4) With recorder jack, can connect record external equipment Technical parameters: 1) Working voltage: DC 12V 2) Max. current: 300mA 3) Output power: 4W + 1W, 100Hz - 15kHz 4) Microphone: -61dB±0.5dB, 20Hz - 16kHz 5) Dimensions (MY-A05): a) Master: 165 x 135 x 70mm b) Substation: 80 x 70 x 15mm