Abstract: A modular device with an injury pack holder (10) is shown for providing cooling and/or heating therapy to an injury, having a generally tubular shape and open first end (15) and an open second end (16). A plurality of module openings (55a, 55b and 55c) are cut through the injury pack holder (10) and covered with a retention mesh (60). A thermoelectric assembly (75) containing a Peltier device (85), fan (110), radiator (120), first plate (80) and second plate (88), transfers heat energy to a gel pack (95) which cools or heats an area, is installed in one of the module openings (55a, 55b, 55c). A battery pack (99) can be installed in another module opening (55a, 55b, 55c) or can be remotely located for operation of the thermoelectric assembly (75). The thermoelectric assembly (75) can be operated with other power supply devices such as a household adapter (160) or an auto adapter (170).