This wireless doorbell is battery operated at both receiver and transmitter . The expected battery life is TWO YEARS ! The transmitter has a common 6 volt battery found at many drug stores. The receiver has  three "D" batteries found everywhere. This chime has a range of up to 150 feet and will either sound a DING DONG or WESTMINSTER CHIME when the the WIRELESS  signal is received.                   $74.95 FREE SHIPPING - UPS GROUND COD'S $10.00 PAY ANY MAJOR CREDIT CARD    FIVE CONVENIENT WAYS TO ORDER: PHONE: 1-800-641-4111 /  1-703-726-8109 FAX IN UNITED STATES: 1-888-814-7526 INTERNATIONAL FAX LINE: 1-253-981-7903  USE OUR SHOPPING CART BELOW  FOR SECURE ONLINE ORDERING       RC-6 DOORBELL - $74.95 HOME     You are visitor:  Send Email to: Webmaster@reliablechimes.com with questions or comments about this web site. RELIABLE CHIMES(sm) 12619 MONARCH CT. LAKE RIDGE, VIRGINIA 22192 COPYWRITE © ©2000 EZTONE  NETWORK COPYRIGHT © 1999,2000,2001,2002,2003,2004 RELIABLE CHIMES (SM) PRIVACY ,RETURN AND  WARRANTY POLICIES