... to the device,and it will show on TV Screen SpecificationsYou can use your mobiphone or ... to the device,and it will show on TV Screen.AdvantagesGSM SMS add to AV signalGSM ... mainly used in the video signal added on TV screen, such as Chinese, characters, simple graphics, etc. ... video promotion, the outdoor advertising business, such as supermarket centralized management... ,Responding to data collectionThe ...