TEMPer2HumiV1.x

Interface type: HID
Common name: TEMPerHUM
TEMPered status: works, since 2012-04-18 (thanks to pjmoreira)
USB IDs: 0C45:7402
Usable interface number: 1
Manufacturer string: RDing
Product string: varies, have seen three so far: "TEMPer2HumiV1.0", "TEMPer2HumiV1.1", "TEMPerHumiV1.0"
Subtype ID: unknown
Temperature sensors: 1 internal SHT1x
Humidity sensors: 1 internal SHT1x

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This device has one internal temperature and humidity sensor, which appears to be an SHT1x or compatible sensor chip.

The subtype ID for this device is unknown because we don't yet know how to fetch the subtype ID from this type of device, and only this subtype is known anyway.

I bought mine (with the "TEMPerHumiV1.0" product string) on DealExtreme, SKU 82776, where it was added on 2011-08-29 by AkElectronics.

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To get the temperature and humidity, query with 01 80 33 01 00 00 00 00. A typical response is 80 04 19 24 04 ca 9c dc, where the temperature is in the third and fourth byte, and the humidity in the fifth and sixth byte.

To calculate the temperature and relative humidity, use the SHT1x methods; the temperature high and low bytes are in offset 2 and 3 respectively, while the relative humidity high and low bytes are in offset 4 and 5 respectively.