diff --git a/OOK.md b/OOK.md
index 49bfe49..6144deb 100644
--- a/OOK.md
+++ b/OOK.md
@@ -1,12 +1,26 @@
-OOK Encoder
+On–off keying (OOK) denotes the simplest form of amplitude-shift keying (ASK) modulation that represents digital data as the presence or absence of a carrier wave. OOK system often have a coding sequence. OOK is often used in remote garage and gate keys, often operating at  315 MHz or 433.92 MHz.  Most modern systems though use a rolling code system to prevent Replay attacks.
 
-## Fields description
+The App has a number of Pre-configured Device types such as 2260,2262,16 Bit, 1527, 526E, T12E, 5026, UM3750, BA5104,145026, HT6***, TC9148.
 
-**Type**: Encoder chip reference / name
+There are 2 Tabs. Key Items on each of the App tabs, that can be selected with the cursor and changed with the encoder knob are:
 
+### Common to all TABs
 
-## Symbols & waveform
+* **Title bar:** The usual items may be changed and displayed.
+* **Frequency:** At the lower part of the App is the Frequency setting. This is stored in persistent memory 
+* **Step size:** This is next to the frequency and allows the selection of the standard step sizes.
+* **Gain:** The gain setting are below the frequency and marked (0-47) LNA(IF) and AMP 0=0db or 1=14dB.
+* **Start:** This button starts the transmission and if pressed again can stop the transmission.
 
-* A for Address
-* D for DATA
-* S for Sync
\ No newline at end of file
+### Config Tab
+
+* **Type:** This is the selection of a pre-Configured Encoder/ decoder chip Type.
+* **Clk:** Selects the frequency of the OOK switching rate. This is interlinked to  the frame rate for example 1kHz clock is 36000 10^6 s frame rate. Range of clock is 1-500KHz.
+* **Frame:** This can be selected but as stated above sets the clock and frame rate. The settings go from 30 10^6s to 36000 10^6s.
+* **Symbols:** This is the pattern of the symbol message sent. The 0/1 can be change to alter the OOK pattern. Note the pattern is made  up as shown  in the letters line of A for Address,  D for DATA,  S for Sync .
+* **Waveform:** This shows the diagrammatic view of the waveform sent.
+* **Progress Bar:** When the transmission is started it shows the progress of the transmission while sending. Not many of the transmission are very short and looks like they are not sent.
+
+### Scan Tab
+
+This is not implemented.