Compatability: Plug-In Timer for use with Kichler's Professional Series, Plus Series and Contractor Series transformers (excluding 15CS75SS, which has a built-in timer) Automation: Used for automating on and off sequencing, with the ability for two on/off cycles per 24-hour period with traditional pin settings Durability: Suitable for outdoor temperatures when placed inside an outdoor transformer enclosure Size: 3" x 3" x 2.75" Material: Constructed of black plasting housing and aluminum