Bridging access points is very useful for larger buildings that require full coverage of a wireless network or buildings with metal objects embeded in the walls as a way of moving the radio around the problem this requires a minimum of 2 Wireless access points with a bridge capacity.

Single access Points are mainly used to add wireless capability to an existing wired network system.

The access points are not very big typically about A5 in size and approximately 2 cm tall although you still need to allow room for the aerial at the back most can be used wall mounted as well as free standing.