二、Waterproof Evaluation
(1) When the cover of the host computer is closed, pure water to the host computer for 10 minutes, and then opens the cover of the host computer, no leakage.
(2) Test the loudspeaker as the above method, no leakage, but attention should be paid to the slot where the wire is connected to the loudspeaker,
Suggestion: it is waterproof but not theftproof. If it is put outdoor for a long time, you‘d better do some theftproof measures.

三、Sounds Evaluation
Sound volume can be adjusted, but the sound should be less than 90 decibel. It will not damage farmers’ hearing ability, but you’d better not put your ear near it for a long time.
Suggestion；
(1) the bio-sound should not be too loud, because it may make birds feel it is not real sound.
(2) If power amplifier is used, the application coverage can be enlarged but the effect is reduced.

四、Effect Evaluation
(1) It is effectively for some common birds, for example, pie, starling etc.
(2) The chips can record many sounds of the bird enemies.
(3) Several birds can be adapted to one sound. Change another chip, birds can be repelled again.
(4) Under the condition of no wind and low noise, it can cover an area of 10 mu.
Suggestion: you’d better change the chips for a period of times and change the position of the loudspeaker and update the integrated chip every half year.

五、Service Life Evaluation
The shell is made up of hard plastic, slow oxidation; the service life is more than 6 years
If it is used in some seasons, the service life is more than 5 years.
If it is used all around the year, the service life is just more than 3 years.