... to 4.2 billions setsPower source of transmitter: 2×AA/AAA batteriesPower source of receiver: AC36V,AC110V,AC120V,AC220V,AC380V,AC/DC12V ... ,AC/DC24VDimension of transmitter (except antenna): HS-4/6 ... ×40mm For more information, please feel free to contact us. Wireless Pendant