Why choose Retekess TW102 Dual-way counter intercom？ 8m external microphone: meet the needs of hospitals, restaurants, clinics, schools, hotels, real estate and other scenarios；Multi-jack design: can connect headphones, wireless microphones, recording equipment, etc. to meet your diverse needs；Multi-button design: mute button, volume knob, independent switch, easier to control the microphone. Window Intercom High-power mic High power for main sound and sub sound signal outputThe sound is clear, natural and loud Microcomputer processing chip Microcomputer processing circuit has noise reduction functionCan effectively resolve echo and howling High sensitivity pickup 360° pointing sound pickup design, effectively recording soundAllows you to easily communicate with customers without getting close to the microphone TT123 Wireless Microphone Headset Why choose to use TT123 wireless microphone ? Easy to pair: TT123 wireless headset microphone automatically connects to when power on, provide loud, clear, high fidelity soundEnjoy wireless freedom: wireless allows you to move more freely, and you don’t have to stick to the counter interphoneWide compatibility: voice amplifier; home stage speakers; portable PA system; mixer( with 6.35mm mic jack); FM transmitter; Not supported phone;laptop;bluetooth speakers Multi-function button Mute button: can freely control the transmission of soundVolume adjustment knob: stepless volume adjustment, select the appropriate volume according to the environmentSwitch button: One-button switch design on the base, more convenient to turn on or off the microphone 2.4G Wireless Microphone Headset Output Power: 10 dBOperating distance: 164ftWorking Current: 35mAWorking voltage: DC 3.7VWorking time: 8hTransmitter battery capacity: 400mAhReceiver battery capacity: 400mAh Package Includes: 1 x Retekess TW102 Dual-way counter interphone 1 x Retekess TW102 External speaker 1 x Power adapter(US plug) 1 x TT123 Wireless mic headset 1 x Double head USB charging cable 1 x 6.35mm converter 1 x English user manual Specification: Material: aluminum alloy shell Connection cable length: 8m / 26.24ft Microphone sensitivity: -48db Size: 115 x75 x 145mm / φ67 x 20mm Weight: 610g / 1.34lb