diff --git a/bundles/org.openhab.binding.bluetooth.airthings/src/main/resources/OH-INF/thing/airthings.xml b/bundles/org.openhab.binding.bluetooth.airthings/src/main/resources/OH-INF/thing/airthings.xml
index 7b7277bc9..930db3f86 100644
--- a/bundles/org.openhab.binding.bluetooth.airthings/src/main/resources/OH-INF/thing/airthings.xml
+++ b/bundles/org.openhab.binding.bluetooth.airthings/src/main/resources/OH-INF/thing/airthings.xml
@@ -132,13 +132,13 @@
 		<state readOnly="true" pattern="%.0f %unit%"/>
 	</channel-type>
 	<channel-type id="airthings_radon_st_avg">
-		<item-type>Number:Density</item-type>
+		<item-type>Number:RadiationSpecificActivity</item-type>
 		<label>Radon Short Term Average Level</label>
 		<description>Radon gas level</description>
 		<state readOnly="true" pattern="%.0f %unit%"/>
 	</channel-type>
 	<channel-type id="airthings_radon_lt_avg">
-		<item-type>Number:Density</item-type>
+		<item-type>Number:RadiationSpecificActivity</item-type>
 		<label>Radon Long Term Average Level</label>
 		<description>Radon gas level</description>
 		<state readOnly="true" pattern="%.0f %unit%"/>
diff --git a/bundles/org.openhab.binding.bluetooth.airthings/src/main/resources/OH-INF/update/update.xml b/bundles/org.openhab.binding.bluetooth.airthings/src/main/resources/OH-INF/update/update.xml
new file mode 100644
index 000000000..90e49b423
--- /dev/null
+++ b/bundles/org.openhab.binding.bluetooth.airthings/src/main/resources/OH-INF/update/update.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<update:update-descriptions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:update="https://openhab.org/schemas/update-description/v1.0.0"
+	xsi:schemaLocation="https://openhab.org/schemas/update-description/v1.0.0 https://openhab.org/schemas/update-description-1.0.0.xsd">
+
+	<thing-type uid="bluetooth:airthings_wave_gen1">
+		<instruction-set targetVersion="1">
+			<update-channel id="radon_st_avg">
+				<type>bluetooth:airthings_radon_st_avg</type>
+			</update-channel>
+			<update-channel id="radon_lt_avg">
+				<type>bluetooth:airthings_radon_lt_avg</type>
+			</update-channel>
+		</instruction-set>
+	</thing-type>
+
+	<thing-type uid="bluetooth:airthings_wave_plus">
+		<instruction-set targetVersion="1">
+			<update-channel id="radon_st_avg">
+				<type>bluetooth:airthings_radon_st_avg</type>
+			</update-channel>
+			<update-channel id="radon_lt_avg">
+				<type>bluetooth:airthings_radon_lt_avg</type>
+			</update-channel>
+		</instruction-set>
+	</thing-type>
+
+</update:update-descriptions>