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Many possibilities. I suggest you, firstly put the batteries in the correct way. Or try to change a battery. If it still do not work, you can give us message again. We will solve the problems for you.
One Zincum 1.5V battery is enough. You should change it according to how often you watch TV. Generally speaking, severa months. But it is not fixed.
Yes, definitely. This is universal TV remote control.