diff --git a/garmin.go b/garmin.go
index fde4dd5..35fcba3 100644
--- a/garmin.go
+++ b/garmin.go
@@ -37,12 +37,12 @@ func newGarminClient(apiKey string) *garminClient {
 	}
 }
 
-func (gc *garminClient) sendMessage(imei, sender, msg string) error {
+func (gc *garminClient) sendMessage(imeis []string, sender, msg string) error {
 	buf := &bytes.Buffer{}
 	err := json.NewEncoder(buf).Encode(garminMessageRequest{
 		Messages: []garminMessage{
 			{
-				Recipients: []string{imei},
+				Recipients: imeis,
 				Sender:     sender,
 				Timestamp:  time.Now().UTC().Format("2006-01-02T15:04:05Z"),
 				Message:    msg,
@@ -84,8 +84,8 @@ func (gc *garminClient) sendMessage(imei, sender, msg string) error {
 
 	log.Printf("[<-garmin] %s", string(body))
 
-	if grResp.Count != 1 {
-		return fmt.Errorf("expected 1 message, got %d", grResp.Count)
+	if grResp.Count != len(imeis) {
+		return fmt.Errorf("expected %d messages, got %d", len(imeis), grResp.Count)
 	}
 
 	return nil
diff --git a/main.go b/main.go
index a7c528e..4be66e9 100644
--- a/main.go
+++ b/main.go
@@ -13,12 +13,12 @@ type PHandler struct {
 	tmpl         *template.Template
 	pd           *pdClient
 	gc           *garminClient
-	garminIMEI   string
+	garminIMEIs  []string
 	garminSender string
 	mux          *http.ServeMux
 }
 
-func NewPHandler(pdRoutingKey, garminAPIKey, garminIMEI, garminSender string) (*PHandler, error) {
+func NewPHandler(pdRoutingKey, garminAPIKey string, garminIMEIs []string, garminSender string) (*PHandler, error) {
 	tmpl := template.New("index.html")
 
 	tmpl.Funcs(template.FuncMap{
@@ -33,7 +33,7 @@ func NewPHandler(pdRoutingKey, garminAPIKey, garminIMEI, garminSender string) (*
 	ph := &PHandler{
 		tmpl:         tmpl,
 		pd:           newPDClient(pdRoutingKey),
-		garminIMEI:   garminIMEI,
+		garminIMEIs:  garminIMEIs,
 		garminSender: garminSender,
 		mux:          http.NewServeMux(),
 	}
@@ -86,7 +86,7 @@ func (ph *PHandler) sendAlert(m string) error {
 
 	if ph.gc != nil {
 		go func() {
-			err := ph.gc.sendMessage(ph.garminIMEI, ph.garminSender, m)
+			err := ph.gc.sendMessage(ph.garminIMEIs, ph.garminSender, m)
 			if err != nil {
 				res <- fmt.Errorf("Error sending to Garmin: %w", err)
 			} else {
@@ -152,17 +152,26 @@ func main() {
 
 	garminAPIKey := os.Getenv("GARMIN_API_KEY")
 
-	garminIMEI := os.Getenv("GARMIN_IMEI")
-	if garminAPIKey != "" && garminIMEI == "" {
+	garminIMEIStr := os.Getenv("GARMIN_IMEI")
+	if garminAPIKey != "" && garminIMEIStr == "" {
 		log.Fatalf("please set GARMIN_IMEI")
 	}
+	var garminIMEIs []string
+	if garminIMEIStr != "" {
+		for _, imei := range strings.Split(garminIMEIStr, ",") {
+			imei = strings.TrimSpace(imei)
+			if imei != "" {
+				garminIMEIs = append(garminIMEIs, imei)
+			}
+		}
+	}
 
 	garminSender := os.Getenv("GARMIN_SENDER")
 	if garminAPIKey != "" && garminSender == "" {
 		log.Fatalf("please set GARMIN_SENDER")
 	}
 
-	ph, err := NewPHandler(pdRoutingKey, garminAPIKey, garminIMEI, garminSender)
+	ph, err := NewPHandler(pdRoutingKey, garminAPIKey, garminIMEIs, garminSender)
 	if err != nil {
 		log.Fatalf("NewPHandler: %s", err)
 	}