diff --git a/modules/hid/hid.go b/modules/hid/hid.go
index 1ae5b3b4..21997859 100644
--- a/modules/hid/hid.go
+++ b/modules/hid/hid.go
@@ -17,6 +17,7 @@ type HIDRecon struct {
 	dongle       *nrf24.Dongle
 	waitGroup    *sync.WaitGroup
 	channel      int
+	devTTL       int
 	hopPeriod    time.Duration
 	pingPeriod   time.Duration
 	sniffPeriod  time.Duration
@@ -45,6 +46,7 @@ func NewHIDRecon(s *session.Session) *HIDRecon {
 		waitGroup:     &sync.WaitGroup{},
 		sniffLock:     &sync.Mutex{},
 		writeLock:     &sync.Mutex{},
+		devTTL:        1200,
 		hopPeriod:     100 * time.Millisecond,
 		pingPeriod:    100 * time.Millisecond,
 		sniffPeriod:   500 * time.Millisecond,
@@ -117,6 +119,10 @@ func NewHIDRecon(s *session.Session) *HIDRecon {
 
 	mod.AddHandler(inject)
 
+	mod.AddParam(session.NewIntParameter("hid.ttl",
+		fmt.Sprintf("%d", mod.devTTL),
+		"Seconds of inactivity to consider a device as not in range."))
+
 	mod.AddParam(session.NewBoolParameter("hid.lna",
 		"true",
 		"If true, enable the LNA power amplifier for CrazyRadio devices."))
@@ -170,6 +176,10 @@ func (mod *HIDRecon) Configure() error {
 		return err
 	}
 
+	if err, mod.devTTL = mod.IntParam("hid.ttl"); err != nil {
+		return err
+	}
+
 	if err, n = mod.IntParam("hid.hop.period"); err != nil {
 		return err
 	} else {
diff --git a/modules/hid/hid_recon.go b/modules/hid/hid_recon.go
index 13df827a..9473ca93 100644
--- a/modules/hid/hid_recon.go
+++ b/modules/hid/hid_recon.go
@@ -68,13 +68,12 @@ func (mod *HIDRecon) onDeviceDetected(buf []byte) {
 	}
 }
 
-var maxDeviceTTL = 20 * time.Minute
-
 func (mod *HIDRecon) devPruner() {
 	mod.waitGroup.Add(1)
 	defer mod.waitGroup.Done()
 
-	mod.Debug("devices pruner started.")
+	maxDeviceTTL := time.Duration(mod.devTTL) * time.Second
+	mod.Debug("devices pruner started with ttl %v", maxDeviceTTL)
 	for mod.Running() {
 		for _, dev := range mod.Session.HID.Devices() {
 			sinceLastSeen := time.Since(dev.LastSeen)