Suitable for HDB/BTO/Condominium! The Key Features of our doorbell: 1. Easy to install No drilling required. Just use existing hole provided in your unit to tighten the doorbell! No special skills required, just follow step-by-step installation guide here 2. Availability of melody selection Finding that normal doorbell chime is a bit “plain”? Other than common “ding-dong” chimes, there are also several melody selections available. 3. Volume adjustable 4. Easy to test melody tunes Monitoring mode is available to allow you to test the sound without the need to physically connecting the doorbell circuitry. The size of the melody door chime is 170mm (Width) x 120mm (Height) x 30mm (Depth) Visit us at www.doorbellsg.com for more information. #bell #home #bto #condominium #hdb