Uniden DCT738 - Manual (Page 19)

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Adding Accessory Handsets
Your.phone.supports.up.to.four.handsets,.including.any.handsets.supplied.with.your.phone..accessory.handsets.do.
not.need.to.be.connected.to.a.phone.jack..You.can.now.place.a.fully-featured.cordless.handset.anywhere.AC.power.
is.available.to.connect.the.handset.charger..All.the.handsets.ring.when.a.call.is.received.
Compatible Handsets
Your.phone.is.compatible.with.the.following.Uniden.2.4.GHz.Digital.Accessory.Handsets:.DCX640,.DCX700,.
DCX730,.and.DCX750..(Please.visit.our.website.at.www.uniden.com.for.the.most.up-to-date.list.of.compatible.
handsets.).If.you.purchase.an.accessory.handset,.you.must.register.the.handset.to.the.base.before.use..Accessory.
handsets.will.not.operate.until.they.are.registered.
DCX640 DCX700 DCX750 DCX730