CONA Wireless Remote Door Bell (White 36 Melodies option , Melodies type: Polyphonic & Duration - 3 to 15 sec Easy to install.Attractive design with touch button and volume control Transmitting range up to 50-60 meters in open air. Suitable for indoor use only Open the Cover of battery Cabinet of Tranmitter and Receiver behind product,load in one "23A 12V" Battery ( Included) for Transmitter and Three "AAA" batteries for receiver (NOT INCLUDED Warranty: 6 month warranty against Manufacturing defect (Not Valid for Burnt, broken, wet and Mis - handling). In case of defect , the defective piece should be sent by buyer to seller(Courier Charges, to be paid by buyer). Fuse is not covered under Warranty. Seller will either repair or replace defective product