Wireless doorbells transmit a signal from the button to ring a chime, which simplifies the installation by removing the need for electrical wiring. They are especially useful for apartment dwellers who may not be permitted to make permanent improvements.
Replace the batteries in the doorbell button and the receiver on the chime. Clean the button so debris cannot prevent it from popping back up after someone presses it.
Set the jumper switches on the button and receiver to the same frequency. If your doorbell rings when nobody is at the door, change the frequency on both pieces to a different setting to avoid interference from remote controlled items such as garage door openers or car alarms.
Make sure the doorbell is within the manufacturer's recommended range of the chime's receiver. Installing the doorbell too close to concrete floors or metal studs may interfere with its ability to transmit a signal.