Hey guys, I was wondering which Bluetooth adapter I needed to buy to be able to pair my phone with the stereo speakers so i can take/make calls through my stereo, I've been doing some research and there's 2 adapters I can buy, but I'm not sure which one I should buy:

Kenwood KCA-BT100

Kenwood KCA-BT200

Obviously, the 200 model is WAY more expensive than the 100 model, I really don't want to spend that much money so i want to go the cheapest route, My question is, will the 100 model work with my stereo? or will I need to buy the 200 one. I've seen about 3-4 websites that tell me to buy the 200 model but I'm wondering wether or not it's necessary. If the BT100 model works I'll be happy, any help is appreciated, thanks.