diff --git a/Dockerfile b/Dockerfile
index d907aad..05b46bd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -46,7 +46,7 @@ RUN uhd_images_downloader
 # install RTL-SDR API
 RUN git clone https://github.com/krakenrf/librtlsdr /opt/librtlsdr \
   && cd /opt/librtlsdr && mkdir build && cd build \
-  && cmake ../ -DINSTALL_UDEV_RULES=ON && make && make install && ldconfig
+  && cmake ../ -DINSTALL_UDEV_RULES=ON -DDETACH_KERNEL_DRIVER=ON && make && make install && ldconfig
 
 FROM blah2_env as blah2
 LABEL maintainer="30hours <nathan@30hours.dev>"
diff --git a/src/capture/kraken/Kraken.cpp b/src/capture/kraken/Kraken.cpp
index b85b971..93bf901 100644
--- a/src/capture/kraken/Kraken.cpp
+++ b/src/capture/kraken/Kraken.cpp
@@ -20,13 +20,17 @@ Kraken::Kraken(std::string _type, uint32_t _fc, uint32_t _fs,
 
     // store all valid gains
     std::vector<int> validGains;
-    int nGains;
+    int nGains, status;
+    status = rtlsdr_open(&devs[0], 0);
+    check_status(status, "Failed to open device for available gains.");
     nGains = rtlsdr_get_tuner_gains(devs[0], nullptr);
     check_status(nGains, "Failed to get number of gains.");
     std::unique_ptr<int[]> _validGains(new int[nGains]);
-    int status = rtlsdr_get_tuner_gains(devs[0], _validGains.get());
+    status = rtlsdr_get_tuner_gains(devs[0], _validGains.get());
     check_status(status, "Failed to get number of gains.");
     validGains.assign(_validGains.get(), _validGains.get() + nGains);
+    status = rtlsdr_close(devs[0]);
+    check_status(status, "Failed to close device for available gains.");
 
     // update gains to next value if invalid
     for (int i = 0; i <= _gain.size(); i++)
@@ -49,8 +53,11 @@ void Kraken::start()
     int status;
     for (size_t i = 0; i < channelIndex.size(); i++) 
     {
-        status = rtlsdr_open(&devs[i], channelIndex[i]);
+        std::cout << "[Kraken] Setting up channel " << i << "." << std::endl;
+        rtlsdr_dev_t* dev;
+        status = rtlsdr_open(&dev, i);
         check_status(status, "Failed to open device.");
+        devs.push_back(dev);
         status = rtlsdr_set_center_freq(devs[i], fc);
         check_status(status, "Failed to set center frequency.");
         status = rtlsdr_set_sample_rate(devs[i], fs);
diff --git a/src/capture/kraken/Kraken.h b/src/capture/kraken/Kraken.h
index 872bac9..405dad2 100644
--- a/src/capture/kraken/Kraken.h
+++ b/src/capture/kraken/Kraken.h
@@ -9,7 +9,8 @@
 /// Requires a custom librtlsdr which includes method rtlsdr_set_dithering().
 /// The original steve-m/librtlsdr does not include this method.
 /// This is included in librtlsdr/librtlsdr or krakenrf/librtlsdr.
-/// @author 30hours
+/// Also works using 2 RTL-SDRs which have been clock synchronised.
+/// @author 30hours, Michael Brock
 /// @todo Add support for multiple surveillance channels.
 /// @todo Replay support.