This particular series has been recently modified to include a cell phone jack designed for "Smartphones" as well Satellite phones.
got it installed, so far is working great, pleased with sound and cord length..
4-Place Intercom (PA-400ST)
The unit appears to be well-made, however a few things could be improved: 1) there needs to be a power-on LED…no way to glance and know if it’s left on...I foresee lots of batteries in my future, 2) the cord leaving the unit is somewhat fragile. I asked to borrow an intercom from my neighbor and he brought over 5 of these units to choose from…unfortunately the cord leaving every one of them was damaged, so I opted to purchase a new one. 3) there is no way to strap or attach this unit … for now it will just sit on the floor under the passenger’s feet. A bit of attached velcro or strapping would be helpful. This may explain why the cord is so frequently damaged.
As advertised w one challenge
Great unit...I purchased this model so I could incorporate the cellphone into my intercom. Unfortunately I haven’t been able to figure out how to make that feature active. I can play music from my iPhone X however not able to hear or speak on the phone when a call is coming in. This could be the X deficiency. I will follow up with you once I arrive back home next week. A good unit just need to work out this one bug for 5 stars! I would Recommend to others. I use it in my hmmwv. Brian