dont do it. this thing is a terrible idea. if it only uses Bluetooth, do you know how easy it is to disable Bluetooth on a phone? and even if you force him to buy one, what's to stop him from just unpairing the devices (and they do have to be paired if it's Bluetooth). this is a bad idea, save your money and just get him a hands free unit or teach him not to talk on the phone while driving.
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dont do it. this thing is a terrible idea. if it only uses Bluetooth, do you know how easy it is to disable Bluetooth on a phone? and even if you force him to buy one, what's to stop him from just unpairing the devices (and they do have to be paired if it's Bluetooth). this is a bad idea, save your money and just get him a hands free unit or teach him not to talk on the phone while driving.