Bell pushes are switches that are only 'On' when someone presses them. Inside the push are two contacts to which the circuit wires are connected. One contact is spring-loaded so that when the bell push is depressed it completes the circuit. When the bell push is released, it springs back to its 'rest' position, breaking the circuit. The little light that you often see on bell pushes is 'On' continuously, and has to be supplied by mains power because, even though it's just a tiny bulb and a trickle of charge, it would soon drain a battery. You can also get luminous 'glow in the dark' bell pushes that don't require power.
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