Retro telephone handset 3.5 mm Classic Mini for mobile phones red Features: Noise reduction system, high-quality speakers and microphone for better conversation comfort. Buttons: simple and buttons, answering and hanging up calls, convenient and easy to use. speaker and microphone: There is a button on the side of the microphone to adjust the volume. Soft touch exterior: suitable for home and office. Move away from your phone to eliminate up to 99% of absorption. mobile phones and computers: most 3.5mm devices. all mobile phones and computers. Specification:_ Model: xsl-560 Material: ABS Plug: 3.5mm Frequency range: 20-20000HZ Sensitivity: 111dB 3% Impedance: 150 ohms Speaker Diameter: 38mm Line length: about 1 meter long Connection plug: 3.5MM four tips Adjustment mode: button Function: Noise reduction system to improve the comfort of conversations. Size chart: 21x5x6cm/8.27x1.97x2.36in The package includes: 1 piece telephone handset