A communication device may include a wireless interface configured to repeat operating sequentially in a plurality of states including a first state and a second state. The communication device may acquire first information from the wireless interface in a case where the wireless interface operating in the first state sends the first polling signal to a first external device and receives a response signal to the first polling signal from the first external device, and supply a specific signal to the wireless interface in a case where the first information is acquired from the wireless interface, the specific signal being for causing the wireless interface to use, as a duration time period of the second state, a specific time period instead of the second predetermined time period, the specific time period being longer than the second predetermined time period.