GIB Series Non-Spring Return Rotary Electronic Damper Actuator, Input Power:24 VAC, Hertz:50-60, 8VA, Standard Cabling, 310 Lb-In Torque, Ambient Temperature Range:-25F to 130F, Designed for Modulating Control of Dampers, Self-Adapting Capabilty for Maximum Flexibility in Damper Positioning, Manual Override,Dims:10 1/4"H X 3 3/4"W X 2 1/2"D,Weight:4 Lbs, In Mfg Box,Made in USA.