This door chime and alarm combo provides a 100dB loud warning. Get a great deal with a set of 3 for ¥1500 (¥500 each). Or, get a set of 2 for ¥1200 (¥600 each). Please ask any questions in the comments. - Brand: ELPA - Model: ARA-04 - Volume: 100dB - Functions: Chime/Alarm - Installation: For doors - Requires 3 AAA alkaline batteries (sold separately) - Please refrain from purchasing if you are concerned about fading due to long-term storage. Thank you for looking.