diff --git a/runtest.sh b/runtest.sh
index 58e45c2..8c920d9 100755
--- a/runtest.sh
+++ b/runtest.sh
@@ -5,6 +5,7 @@ RECIPIENT=conrad.nelson@nebraska.gov
 NUM_TESTS=1
 NUM_SAMPLES=5
 TIME_BETWEEN=15m
+INTERFACE=wlan0
 BOOT_ID=$(cat /proc/sys/kernel/random/boot_id)
 TEST_FILE="/home/yaro/${BOOT_ID}-speedtest.csv"
 PING_COUNT=25
@@ -15,7 +16,7 @@ ENRICHED_FILE="${TEST_FILE%}+rf.csv"
 
 # Function to get current TX failed count
 get_tx_failed() {
-  iw dev wlan0 station dump | awk '/tx failed/ {print $3}'
+  iw dev $INTERFACE station dump | awk '/tx failed/ {print $3}'
 }
 
 freq_to_channel() {
@@ -57,7 +58,7 @@ while [ "$COUNTER" -lt "$NUM_TESTS" ]; do
 
     # Wireless stats
     link_level_noise=$(awk 'NR==3 {gsub(/\./, "", $3); gsub(/\./, "", $4); gsub(/\./, "", $5); print $3","$4","$5}' /proc/net/wireless)
-    bssid_and_bitrate=$(iw dev wlan0 link | awk '/Connected/ {bssid=$3} /tx bitrate/ {tx=$3} /rx bitrate/ {rx=$3} END {print bssid","tx","rx}')
+    bssid_and_bitrate=$(iw dev $INTERFACE link | awk '/Connected/ {bssid=$3} /tx bitrate/ {tx=$3} /rx bitrate/ {rx=$3} END {print bssid","tx","rx}')
 
     # Speed test
     speed_results=$(speedtest --secure --csv)
@@ -67,7 +68,7 @@ while [ "$COUNTER" -lt "$NUM_TESTS" ]; do
     FAILED_DELTA=$((FAILED_NOW - FAILED_START))
     FAILED_START=$FAILED_NOW  # Update for next sample
 
-    freq=$(iw dev wlan0 link | awk '/freq:/ {print $2}')
+    freq=$(iw dev $INTERFACE link | awk '/freq:/ {print $2}')
     channel=$(freq_to_channel "$freq")
 
     packet_loss=$(ping -c $PING_COUNT -q $PING_TARGET | grep -oP '\d+(?=% packet loss)')