Portable device for pest control and protection of areas from the presence of insects, particularly harmful to humans, comprising:: - a movable holding member provided with opening parts to access the inside; - at least two tanks (7, 8), housed in said movable holding member, respectively adapted to contain a first and a second liquid solution of active principles (70, 80); - a first and a second outlet duct (71, 81), associated to the respective tanks (7, 8) and provided for the withdrawal from these of said first and second liquid solution of active principles (70, 80); - a electro-actuated three-way shutoff valve, with two ways which connected to said first and second outlet duct (71, 81), while the third way connected to a delivery conduit; - a pump, associated with said delivery conduit, adapted to draw the above-mentioned first or second liquid solution of active principles (70, 80) from the respective tanks (7, 8) and to send them, under pressure, to a distribution system, connected downstream of said delivery conduit and constituted by a plurality of ducts provided, at their ends, to the corresponding spray nozzles adopted to project jets of said first or second liquid solution of active principles (70, 80) in the surrounding environment, with a predetermined direction; - command and control means, governed by an electronic processor and adapted to actuate and deactivate the device in accordance with predetermined schedules and operating cycles, for spraying the said areas with said first or second liquid solution of active principles (70, 80); - at least one rechargeable battery, intended to supply with electric power said command and control means and, through these, the aforementioned three-way shut-off valve and pump; - recharge means, associated with said rechargeable battery, adapted to draw electric power from outside sources and to enter it into the latter with a predetermined voltage and intensity; - a kit for protection of limited areas comprising a plurality of flexible extensions, a plurality of spray nozzles associated to the flexible extensions, connecting elements, closing elements and fitting elements so that a three-way fitting element replaces one of the spray nozzles while closing elements are associated to the face for replacing the other spray nozzles, to the free ends of the fitting element being associated the flexible extensions providing spraying nozzles at preset distances, until they join to create a closed path having a perimeter equal to the sum of the lengths of the flexible extensions used. - a movable holding member provided with opening parts to access the inside; - at least two tanks (7, 8), housed in said movable holding member, respectively adapted to contain a first and a second liquid solution of active principles (70, 80); - a first and a second outlet duct (71, 81), associated to the respective tanks (7, 8) and provided for the withdrawal from these of said first and second liquid solution of active principles (70, 80); - a electro-actuated three-way shutoff valve, with two ways which connected to said first and second outlet duct (71, 81), while the third way connected to a delivery conduit; - a pump, associated with said delivery conduit, adapted to draw the above-mentioned first or second liquid solution of active principles (70, 80) from the respective tanks (7, 8) and to send them, under pressure, to a distribution system, connected downstream of said delivery conduit and constituted by a plurality of ducts provided, at their ends, to the corresponding spray nozzles adopted to project jets of said first or second liquid solution of active principles (70, 80) in the surrounding environment, with a predetermined direction; - command and control means, governed by an electronic processor and adapted to actuate and deactivate the device in accordance with predetermined schedules and operating cycles, for spraying the said areas with said first or second liquid solution of active principles (70, 80); - at least one rechargeable battery, intended to supply with electric power said command and control means and, through these, the aforementioned three-way shut-off valve and pump; - recharge means, associated with said rechargeable battery, adapted to draw electric power from outside sources and to enter it into the latter with a predetermined voltage and intensity; - a kit for protection of limited areas comprising a plurality of flexible extensions, a plurality of spray nozzles associated to the flexible extensions, connecting elements, closing elements and fitting elements so that a three-way fitting element replaces one of the spray nozzles while closing elements are associated to the face for replacing the other spray nozzles, to the free ends of the fitting element being associated the flexible extensions providing spraying nozzles at preset distances, until they join to create a closed path having a perimeter equal to the sum of the lengths of the flexible extensions used.