Power Management in the key point of embedded devices because of the limited power capacity. On Tizen 4.0, PASS (Power Aware System Service) is the power management service which provides the common interface to allocate the limited resources efficiently in order to meet the performance demands and power-consumption requirements. Tizen 4.0 platform developers or vendors may tune the behaviors of PASS governor for their own devices by modifying the configuration file of PASS. It allocates the power-related resources according to the configurations, which may emphasize either power-consumption or performance (or even "balanced") and the current user context (e.g., launching a heavy app, touching or swiping the touchscreen and so on). PASS supports PM_QOS based the scenarios as well. The configuration file of PASS includes CPU, Memory Bus, GPU information and the scenario list.