As our doorbell is broken at home and can not be repaired, I was looking for an alternative. Have decided to use this wireless doorbell and did not regret buying. Bell has a very good range, can be very good install (wall socket or, alternatively, with batteries as two receivers are available). Works without problems and without time (transmitter be fitted with battery and receiver in socket finished). Stored melody was retained because ideal. Volume can be adjusted three times (enough). Manual is sufficient and contains the most important information (also the ringer and volume adjust / save) and is easy to understand. Product is highly recommended and has a very good value for money.