diff --git a/frontend/src/components/ui/SignalIndicator.jsx b/frontend/src/components/ui/SignalIndicator.jsx
index 4227046..01f3432 100644
--- a/frontend/src/components/ui/SignalIndicator.jsx
+++ b/frontend/src/components/ui/SignalIndicator.jsx
@@ -4,10 +4,9 @@
 //
 // Props:
 //   rssi      — number | null | undefined — signal strength in dBm (e.g. -62). null/undefined = unknown.
-//   isOnline  — boolean | undefined — when explicitly false, renders a dimmed amber
-//               glyph with a diagonal slash overlay regardless of rssi, so a stale
-//               last-known reading from an offline device never reads as a live
-//               "full signal". When true (or undefined) but rssi is null/undefined,
+//   isOnline  — boolean | undefined — when explicitly false, renders a fully grey
+//               (unlit) glyph regardless of rssi, so a stale last-known reading from
+//               an offline device never reads as a live "full signal". When true (or undefined) but rssi is null/undefined,
 //               renders an amber "?" instead — legacy v1-firmware devices report a
 //               heartbeat with no rssi field at all (see API Reference: legacy
 //               heartbeats predate rssi/state/ok), so "online with unknown signal"
@@ -51,7 +50,7 @@ export default function SignalIndicator({ rssi, isOnline, size = 'md', className
   const unsupported = !offline && !known && isOnline === true
   const muted = offline || unsupported
   const level = known ? rssiToLevel(rssi) : 0
-  const color = muted ? 'var(--color-warning)' : rssiToColor(known ? rssi : null)
+  const color = unsupported ? 'var(--color-warning)' : rssiToColor(known ? rssi : null)
   const { box, strokeWidth } = SIZES[size] || SIZES.md
   const label = offline
     ? 'Signal strength unavailable — device offline'
@@ -101,15 +100,6 @@ export default function SignalIndicator({ rssi, isOnline, size = 'md', className
         strokeLinecap="round"
         style={{ transition: 'stroke 0.2s' }}
       />
-      {/* Offline overlay — amber diagonal slash, standard "no signal" convention */}
-      {offline && (
-        <path
-          d="M3 21L21 3"
-          stroke={color}
-          strokeWidth={strokeWidth}
-          strokeLinecap="round"
-        />
-      )}
       {/* Unsupported overlay — amber "?", device is online but its firmware never reports rssi (v1 API) */}
       {unsupported && (
         <text