Son compatibles para cualquier marca de bocinas?

Saludos según mis conocimiento no deberían tener problemas.

Mic material? Metal or plastic

They are mostly plastic. But they actually work really well. I use them for an open mic in a bar and they work really well.

Do you need touch it with lips for sound to get picked up? Thanks in advance.

Not at all. They pick up the sound from whether you are far or near. They're unidirectional so you need to be in front of the microphone. This is good because you don't have feedback from the speakers.

ASIN	B076N8Y9TY
Audio sensitivity	260 Decibels
Batteries	1 Lithium Ion batteries required.
Date First Available	26 April 2016
Delivery information	We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout.
Frequency response	260 MHz
Hardware platform	Karaoke Machine
Impedance	600 Ohms
Item Weight	3.6 kg
Item dimensions L x W x H	48.3 x 10.2 x 5.1 centimetres
Item model number	G-380H
Manufacturer	GTD Audio
Material	plastic and electronic components
Material Type	plastic and electronic components
Microphone form factor	Handheld
Number of batteries	1 Lithium Ion batteries required.
Number of channels	4
Power source	Battery Powered
Product Dimensions	48.26 x 10.16 x 5.08 cm; 3.6 kg
Signal-to-noise ratio	120 dB
UPC	854318007165

GTD Audio4 Handheld Wireless Microphone Cordless mics System, Ideal for Church, Karaoke, Dj Party, Range up to 300 ft,

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