Electronic device and power back off control method thereof

An electronic device comprising:

• a housing including a first surface facing a first direction, a second surface facing a second direction opposite the first direction, and side surfaces that surround at least a part of a space between the first surface and the second surface;
• a first sensor and a second sensor disposed in the housing or exposed through at least one of the first, the second and the side surfaces;
• a communication circuit disposed in the housing;
• an antenna radiator electrically connected with the communication circuit;
• and
• a control circuit electrically connected with at least one of the first and second sensors, the communication circuit, and the antenna radiator,
• wherein the control circuit is configured to:
• transmit and/or receive a first signal to and/or from an external device, using the communication circuit;
• detect, using the first sensor, whether an external object has approached within a predetermined distance between the external object and at least a part of the antenna radiator to generate a second signal;
• detect, using the second sensor, a location of the electronic device at which the external object approaches on least one surface of the housing to generate a third signal;
• and
• determine whether to decrease a strength of the first signal, based on the generated second signal and third signal.