The OWC In-line Digital Thermal Sensor is a temperature sensor cable for the Apple iMac (OWCDIDIMACHDD11). It is compatible with the Apple 21.5-inch and 27-inch iMac models from 2011. With this installation kit, you can remove the old hard drive and upgrade to a new hard drive with up to 4.0 TB of storage.

For iMac (21.5-inch Late 2011) (August 2011) Model ID: iMac12,1 3.1 GHz i3.
For iMac (21.5-inch Mid 2011) (May 2011) Model ID: iMac12,1 2.5 GHz i5, 2.7 GHz i5, 2.8 GHz i7.
For iMac (27-inch May 2011) Model ID: iMac12,2 2.7 GHz i5, 3.1 GHz i5, 3.4 GHz i7.

The installation kit includes the following parts: a standard iMac HDD power cable with an internal digital thermal sensor module. This kit includes only the OWC In-line Digital Thermal Sensor cable.