For the full range of compatible devices refer to the device code listing enclosed with this product. The remote control has 4 labelled device keys. These are TV, STB (Set top box), DVD and AUX (Auxiliary). However, any type of device can be programmed into any button. Instructions Install batteries in unit (batteries not supplied - requires 2 x AA cells). The battery compartment is on the rear of the unit. Insert batteries in direction indicated in battery compartment. Code Programming The unit