BIG BEN Friedland Big Ben Chime - 171 x 105 x 49mm - D230Dimensions 171 x 105 x 49mm Features 2+1notes (back door option) Requires either 4 x R14 C batteries or 753 or 780 transformer 80dB @ 1m Range Overview A range that combines high quality, imaginative design and value for money. There is an extensive choice of sounds, plus products with a two chime signal facility one for the front door, the other for the rear. Power can be provided either by batteries or from an external transformer.