No. SmartCats StayHome products will not harm birds.
Small birds will sit on the wire and not be aware of anything and will not be harmed or deterred.
Larger birds will sit on the wire and the weight of the bird will cause the wire to sag under the weight, when the wire touches the fence it will make a clicking noise, the bird does not feel anything and is not harmed but because it is a wild animal the bird will instinctively move away and land somewhere else.
Birds are not harmed in any way by the cat fence.