02 V70 Alarm siren and alarm receiver with fobs
 

Looking for alarm siren ideally in good working condition part number 8637399.
Also looking for a fob receiver with 2 fobs for the same car I dont have part number for this but can look in case you believe to be for the same car.

if you are hoping this is a cheap option to get some keys working with your car it won't work , volvos security is much higher than the S/V40 which this method can work on .

no keys. Fobs only. Not even if i buy a receiver and fobs from the same car?

that's right the security is handled by the receiver , and the CEM all must match before unlocking is allowed . it gets more complicated with the key and starting ..

ok... didn't expect that. Any issues by having an aftermarket chinese one like this one? I read several reviews seems to work well in other cars. MY car siren is not working . the original alarm is not operating as well.
https://www.ebay.co.uk/p/2x-Car-2-Re....c100005.m1851

No that is no good , ok on a 20 year old car but not yours with a modern network electrical system .. why don't you just buy a new fob ?

The car is nearly 20 years old even tough a nice car I doubt anyone would try to break in wireslly in a old car like this. With a family and kids a new operating fobs would be a very practical addition to let kids in instead to have to open the car always with the door key. I know no aftermarket solution will ever be the same quality and security of volvo original ones.
The cheapest 2x new fobs I saw would cost me £150 + 2 x£35 for linking fobs with car labout hour + whatever cost of the software to be downloaded from volvo. This would be nearly £300 for new fobs operating in this car. This is a lot for fobs in a 16 years old car. I wondering how an aftermarket fob/receiver like this is linked with a potential operating volvo alarm. Is it completly independent? What would be the drawnbacks if any?

It is wise to have two but why not just get one ? The value and age of the car has nothing to do with it unless you plan to sell it . and if you do , the next owner would want a fob ..