Heat Pump 

Non-Programmable 

Battery

2-Stage Heat Pump
For 24 VAC Systems
Mercury-Free Environmentally Safe

Terminations: R, C, Y1, Y2, W2, O, B, G, E, L
Two Sizes: ACC-WP01 (4 27/32" x 5 15/16") & ACC-WP02 (5 19/32" x 7 1/2")