Heath Zenith 122C-A Ten-Volt Lock-Nut Transformer
Use this lock-nut-type transformer to replace an existing transformer or to install a new low-voltage doorbell system. Works with 120-volt AC input (output is 16-volt AC, 10-volt ampere). Remember to turn off the power at the fuse or junction box before installing.--Josh DettweilerWhat's in the BoxTransformer