"SE STRANGER window speaker will empower your business with crystal and smooth way. Specification: Working voltage: AC9V/1A Inside microphone: -48db 20Hz-20KHz Outside microphone: -48db 20Hz-16KHz Exterior size: 158x87x46mm / 78x20mm Hot Spots: High quality speaker for main unit and extension. High sensitive microphone. Longer metal tube microphone for dual-way intercommunication Adjustable volume with separate switch Auto dual-way intercommunication without pressing any button External speaker, slim fit design Anti-interference and noise-free function 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 What you will get 1 x A-3 Dual-way counter interphone 1 x Charger 1 x English User manual • Quality diaphragm, clear call Se Stranger A3 window intercom system has the quality diaphragm, it will keep your communication clearly and smoothly. • Smart microphone Excellent metallic material microphone not only transmit clearly, but also could adjust height according to your needs. • Length enough 187 cm outside microphone line will offer you more convenient. Easy to install and use. • Clearly instruction and easy to use There are clearly instruction for every button, and it is easy to use for your group. Tip lights will remind you if your voice have been transmitted successfully. • Clear and distinguished voice Comprehensive application of electro-acoustic technology experience, the selection of high performance electro-acoustic circuit design, the output power up to 3W, voice clear and loud voice distinguished high • Streamline design Main unit is made of luxurious aluminium alloy and internal microphone for extension. One-wire connection and simple installation ________________________________________ Specifications Brand Se Stranger Colour Silver Assembled Product Dimensions (L x W x H) 7.20 x 7.00 x