diff --git a/internal/services/services.go b/internal/services/services.go
index 8275474..7a13902 100644
--- a/internal/services/services.go
+++ b/internal/services/services.go
@@ -25,7 +25,8 @@ func BuildService[
 		Number |
 		Scene |
 		TTS |
-		Vacuum,
+		Vacuum |
+		ZWaveJS,
 ](conn *ws.WebsocketWriter, ctx context.Context) *T {
 	return &T{conn: conn, ctx: ctx}
 }
diff --git a/internal/services/zwavejs.go b/internal/services/zwavejs.go
new file mode 100644
index 0000000..f19fc6f
--- /dev/null
+++ b/internal/services/zwavejs.go
@@ -0,0 +1,29 @@
+package services
+
+import (
+	"context"
+
+	ws "saml.dev/gome-assistant/internal/websocket"
+)
+
+/* Structs */
+
+type ZWaveJS struct {
+	conn *ws.WebsocketWriter
+	ctx  context.Context
+}
+
+/* Public API */
+
+// ZWaveJS bulk_set_partial_config_parameters service.
+func (zw ZWaveJS) BulkSetPartialConfigParam(entityId string, parameter int, value any) {
+	req := NewBaseServiceRequest(entityId)
+	req.Domain = "zwave_js"
+	req.Service = "bulk_set_partial_config_parameters"
+	req.ServiceData = map[string]any{
+		"parameter": parameter,
+		"value":     value,
+	}
+
+	zw.conn.WriteMessage(req, zw.ctx)
+}
diff --git a/service.go b/service.go
index 1fd80b8..f75a3d5 100644
--- a/service.go
+++ b/service.go
@@ -27,6 +27,7 @@ type Service struct {
 	Scene             *services.Scene
 	TTS               *services.TTS
 	Vacuum            *services.Vacuum
+	ZWaveJS           *services.ZWaveJS
 }
 
 func newService(conn *ws.WebsocketWriter, ctx context.Context, httpClient *http.HttpClient) *Service {
@@ -49,5 +50,6 @@ func newService(conn *ws.WebsocketWriter, ctx context.Context, httpClient *http.
 		Scene:             services.BuildService[services.Scene](conn, ctx),
 		TTS:               services.BuildService[services.TTS](conn, ctx),
 		Vacuum:            services.BuildService[services.Vacuum](conn, ctx),
+		ZWaveJS:           services.BuildService[services.ZWaveJS](conn, ctx),
 	}
 }