Alt-clicking descriptions when examining

code/game/objects/items/devices/PDA/PDA.dm

@@ -58,6 +58,13 @@ GLOBAL_LIST_EMPTY(PDAs)
 	var/obj/item/inserted_item //Used for pen, crayon, and lipstick insertion or removal. Same as above.
 	var/overlays_x_offset = 0	//x offset to use for certain overlays
 
+/obj/item/device/pda/examine(mob/user)
+	..()
+	if(!id && !inserted_item)
+		return
+	else
+		to_chat(user, "<span class='notice'>Alt-click to remove contents.</span>")
+
 /obj/item/device/pda/Initialize()
 	. = ..()
 	if(fon)

code/game/objects/items/devices/gps.dm

@@ -1,7 +1,7 @@
 GLOBAL_LIST_EMPTY(GPS_list)
 /obj/item/device/gps
 	name = "global positioning system"
-	desc = "Helping lost spacemen find their way through the planets since 2016. Alt+click to toggle power."
+	desc = "Helping lost spacemen find their way through the planets since 2016."
 	icon = 'icons/obj/telescience.dmi'
 	icon_state = "gps-c"
 	w_class = WEIGHT_CLASS_SMALL
@@ -15,6 +15,9 @@ GLOBAL_LIST_EMPTY(GPS_list)
 	var/updating = TRUE //Automatic updating of GPS list. Can be set to manual by user.
 	var/global_mode = TRUE //If disabled, only GPS signals of the same Z level are shown
 
+/obj/item/device/gps/examine(mob/user)
+	..()
+	to_chat(user, "<span class='notice'>Alt-click to switch it [tracking ? "off":"on"].</span>")
 
 /obj/item/device/gps/Initialize()
 	. = ..()
@@ -209,4 +212,4 @@ GLOBAL_LIST_EMPTY(GPS_list)
 		clear()
 	tagged = null
 	STOP_PROCESSING(SSfastprocess, src)
-	. = ..()
+	. = ..()

code/game/objects/items/devices/radio/headset.dm

@@ -1,6 +1,6 @@
 /obj/item/device/radio/headset
 	name = "radio headset"
-	desc = "An updated, modular intercom that fits over the head. Takes encryption keys. \nTo speak on the general radio frequency, use ; before speaking."
+	desc = "An updated, modular intercom that fits over the head. Takes encryption keys."
 	icon_state = "headset"
 	item_state = "headset"
 	materials = list(MAT_METAL=75)
@@ -11,6 +11,12 @@
 	var/obj/item/device/encryptionkey/keyslot2 = null
 	dog_fashion = null
 
+/obj/item/device/radio/headset/examine(mob/user)
+	..()
+	to_chat(user, "<span class='notice'>To speak on the general radio frequency, use ; before speaking.</span>")
+	if (command)
+		to_chat(user, "<span class='notice'>Alt-click to toggle the high-volume mode.</span>")
+
 /obj/item/device/radio/headset/Initialize()
 	. = ..()
 	recalculateChannels()