YTYKINOY Vintage Retro 3.5mm Telephone Handset Cell Phone Receiver Mic Microphone Speaker for iPhone iPad Mobile Phones Cellphone Smartphone (Green) Green industrial simply use the setting that

simply use the setting that works with your phone for optimal sound

rigging and anchoring hardware - allows fastest connect/disconnect

employees and customers to use when needed in school

It can be used both daily and industrial temperature measurement

you only need to wipe with a damp cloth to remove the stains on the surface

YTYKINOY Vintage Retro 3.5mm Telephone Handset Cell Phone Receiver Mic Microphone Speaker for iPhone iPad Mobile Phones Cellphone Smartphone (Green) Green industrial simply use the setting thatYTYKINOY Vintage Retro 3. 5mm Telephone Handset Cell Phone Receiver Mic Microphone Speaker for iPhone iPad Mobile Phones Cellphone Smartphone (Green) Compatible: iphone 4 5 6 with 3. 5mm socket, Android phone with 3. 5mm socket. Need a adapter(MUST support calling function): iphone 7 7+ and later model, Android phone without 3. 5mm socket. Note: Red light is just only a decoration. Some Android phone need to adjust the volume on cellphone for volume