BELLA-2 DOORBELL – Digital wireless doorbell. – With bright LED light indicator. – Strong Anti-jamming system, unique code to avoid false trigger. – Sound: digital 4 chord, 20 melodies. – Volume: 70-80db (3 steps, low.middle,high). – Working Range: 100m (in open spaces). – Transmitter Voltage: 12V V23GA battery (included). – Receiver Voltage: 4.5V 3xAAA batteries (are not included). – White & Grey color.