Patent ID: 8249557

Claim:
A mobile phone comprising: a power on/off terminal; a fingerprint input unit to read and record fingerprint information of a user, and output the fingerprint information; a storage unit storing a fingerprint mode; a switch unit connected to the power on/off terminal; a control unit to receive the fingerprint information and compare the received fingerprint information with the stored fingerprint mode, wherein upon a condition that the received fingerprint information is not consistent with the stored fingerprint mode and the mobile phone is at a power-off state, the control unit outputs a first control signal to control the switch unit to keep the mobile phone being at the power-off state; and an alarm unit connected to the control unit; wherein upon a condition that the received fingerprint information is consistent with the stored fingerprint mode and the mobile phone is at a power-on state, the control unit starts the alarm unit predetermined times to remind whether the mobile phone needs to be turned off; upon a condition that the control unit does not receive the fingerprint information again after the alarm unit is started the predetermined times, the control unit outputs the first control signal to the switch unit to keep the mobile phone being at the power-on state; upon a condition that the control unit still receives the fingerprint information after the alarm unit is started the predetermined times, the control unit outputs a second control signal to the switch unit to turn off the mobile phone, and the control unit records that the mobile phone is at the power-off state.