A:AnswerNo, this unit is not resistant to moisture infiltration. Would suggest one of three paths if it is likely water will be a problem (i.e. top down in rain, wheeling, etc.). 1. Buy a marine radio instead - they make them in the same form factor as this radio, search this site. 2. Buy a marine radio cover to protect this non-marine radio (Metra makes them, Best Buy has them on this website). 3. Buy cheap radios and replace as required. Note there are marine speakers too that are water resistant, if your son intends to get deep into wheeling.
A:AnswerThe only option the radio offers for something external is the auxiliary connection which is the headphone jack. If your external CD player has an audio out via auxiliary then that would work. Check with the manufacture of the CD player to check on its options.
A:AnswerWith the KD-X270BT you can have up to 5 phone paired to it however you can only use one device at a time. The radio through the menu lets you select the device you want paired to the radio.
