There are two distinct categories of Pendulum Wall Clocks, Keywound Wall Clocks and Quartz Wall Clocks with pendulums.
Weight Driven Keywound Pendulum Wall Clocks
These clocks come in a variety of different styles and finishes. The movement is the heart of the clock which keeps the time and operates any chiming functions if so equipped. The pendulums on these clocks are powered by the pull of gravity on a single or two weights that fall usually over the course of a week, then need to be wound with a key to pull the weight back up so that it may power the clock for another week or longer. Weight driven keywound clocks are considered to be the finest and most accurate wall clocks available. Most are wound with a key, but some of the unique skeleton clocks have exposed movements where you may see the gears require pulling a chain down once a week with pulls the weight(s) on the other end of the chain to power the clock. Spring Driven Keywound Wall Clocks also come in a variety of different styles and finishes. and are usually shorter in height as no weights are needed. Two or three wound springs inside the clock power the gears and pendulum to move and keep the proper time and chiming clock functions if so equipped. These clocks are more popular also less expensive than weight-driven clocks.
Quartz Pendulum Wall Clocks
Quartz pendulum wall clocks are battery powered and are a great, lower-cost alternative to key-wound clocks. The batteries will power the clock for about a year at a time and these clocks are very accurate and need no maintenance. The pendulum swings by using a pulsing magnetic field which is powered by the batteries. Many of these clocks offer a chiming function where the clock will play Westminster chimes or other melodies on the hour and some also offer quarter-hour chimes referred to as 4/4 chimes. Some of these chime sounds are very authentic and can offer options such as night-time chime shutoff and a volume control not available on key-wound clocks. Quartz Pendulum wall clocks are usually about half the price of a keywound clock using the same size and finished case.
The Clock Depot offers pendulum wall clocks and many additional resources on making a good decision for a new clock for your home.