Boao 4 Pieces Headset Microphone, Flexible Boom for Voice Amplifier not Phone or PC, Teachers, Speakers, Singer, Dancer, Coaches, Presentations, Seniors

Features: These headset microphone can give you a loud, clear, high fidelity voice. Usage: It is suitable for teachers in class, stage performance, singing, dancing and so on. Microphone: 6.0 x 5.0 mm Plug diameter: 3.5 mm Headphone cable: about 1.2 m Straw: 11.8 cm Sensitivity: -52dB+3dB/-52dB-3dB Directionality: single point Impedance: less than or equal to 2.2 kiloohm Working voltage: 2.0V Frequency range: 100-16kHz Signal to noise ratio: greater than 60dB Specifications: Material: nylon rope, iron wire, rubber Color: black Size: approx.19 x 13 x 1 cm/ 7.48 x 5.12 x 0.39 inches Package includes: 4 x Headset microphone Notes: Please allow a little error in the size due to manual measurement. The colors may exist slight differences due to different screens.