About products and suppliers:
Tradechina.com offers 1199 20 channel dvr products. About 62% % of these are car black box, 8%% are surveillance system, and 7%% are digital video recorder.
A wide variety of 20 channel dvr options are available to you, such as h.265, h.264.
There are 1200 20 channel dvr suppliers, mainly located in Asia. ,