diff --git a/Mouse.cpp b/Mouse.cpp
index 328ddb3..18e1fa7 100644
--- a/Mouse.cpp
+++ b/Mouse.cpp
@@ -33,8 +33,22 @@ void Mouse::discoverDevices() {
         libusb_device_descriptor desc;
         libusb_get_device_descriptor(devs[i], &desc);
         if (isCompatibleDevice(desc)) {
-            if(libusb_open(devs[i], &currentDevice) != 0)
-                continue;
+            switch (int status = libusb_open(devs[i], &currentDevice)) {
+                case 0:
+                    break;
+                case LIBUSB_ERROR_NO_MEM:
+                    cout << "LIBUSB_ERROR_NO_MEM" << endl;
+                    continue;
+                case LIBUSB_ERROR_ACCESS:
+                    cout << "LIBUSB_ERROR_ACCESS" << endl;
+                    continue;
+                case LIBUSB_ERROR_NO_DEVICE:
+                    cout << "LIBUSB_ERROR_NO_DEVICE" << endl;
+                    continue;
+                default:
+                    cout << "Status: " << status << endl;
+                    continue;
+            }
 
             if(libusb_kernel_driver_active(currentDevice, 2) == 1)
                 if(libusb_detach_kernel_driver(currentDevice, 2) != 0) {
@@ -90,14 +104,26 @@ int Mouse::setBackLightLevel(uint8_t level) {
 }
 
 int Mouse::writeToMouse(uint8_t data[], size_t size) {
-    int res =  libusb_control_transfer(currentDevice,0x21,9,
-                                       0x0307,2,data,size,10000);
-    if(res < 0){
-        cout<<"Unnable to send command"<<endl;
-        return -1;
+    int res = libusb_control_transfer(currentDevice, 0x21, 9,
+                                      0x0307, 2, data, size, 10000);
+    switch (res){
+        case LIBUSB_ERROR_TIMEOUT:
+            cout << "LIBUSB_ERROR_TIMEOUT" << endl;
+            return -1;
+        case LIBUSB_ERROR_PIPE:
+            cout << "LIBUSB_ERROR_PIPE" << endl;
+            return -1;
+        case LIBUSB_ERROR_NO_DEVICE:
+            cout << "LIBUSB_ERROR_NO_DEVICE" << endl;
+            return -1;
+        case LIBUSB_ERROR_BUSY:
+            cout << "LIBUSB_ERROR_BUSY" << endl;
+            return -1;
+        case LIBUSB_ERROR_INVALID_PARAM:
+            cout << "LIBUSB_ERROR_INVALID_PARAM" << endl;
+        default:
+            return 0;
     }
-
-    return 0;
 }
 
 int Mouse::readFromMouse(uint8_t *request, size_t requestSize, uint8_t *response, size_t responseSize) {
@@ -166,6 +192,18 @@ void Mouse::listDevices() {
             case BLOODY_A9_PID:
                 name = "Bloody A9";
                 break;
+            case BLOODY_RT5_PID:
+                name = "Bloody RT5";
+                break;
+            case BLOODY_V8M_PID:
+                name = "Bloody V8M";
+		break;
+            case BLOODY_R8_PID:
+                name = "Bloody R8";
+                break;
+            case BLOODY_J95S_PID:
+                name = "Bloody J95S";
+                break;
             default:
                 name = "Unknown";
         }
diff --git a/Mouse.h b/Mouse.h
index a790658..d4d498d 100644
--- a/Mouse.h
+++ b/Mouse.h
@@ -9,6 +9,10 @@
 
 static const int A4TECH_VID = 0x09da;
 
+static const int BLOODY_J95S_PID = 0xfee3;
+static const int BLOODY_RT5_PID = 0x7f1b;
+static const int BLOODY_V8M_PID = 0x1094;
+static const int BLOODY_R8_PID = 0x7c10;
 static const int BLOODY_V5_PID = 0x172A;
 static const int BLOODY_V7_PID = 0xF613;
 static const int BLOODY_V8_PID = 0x11F5;
@@ -20,7 +24,7 @@ static const int BLOODY_R70_PID = 0xf643;
 static const int BLOODY_A7_PID = 0x7e36;
 static const int BLOODY_A9_PID = 0x1003;
 
-static const int COMPATIBLE_PIDS[] = {BLOODY_V5_PID, BLOODY_V7_PID, BLOODY_V8_PID, BLOODY_R7_PID, BLOODY_R8_1_PID, BLOODY_R3_PID, BLOODY_AL9_PID, BLOODY_R70_PID, BLOODY_A7_PID, BLOODY_A9_PID};
+static const int COMPATIBLE_PIDS[] = {BLOODY_J95S_PID, BLOODY_RT5_PID, BLOODY_V8M_PID, BLOODY_R8_PID, BLOODY_V5_PID, BLOODY_V7_PID, BLOODY_V8_PID, BLOODY_R7_PID, BLOODY_R8_1_PID, BLOODY_R3_PID, BLOODY_AL9_PID, BLOODY_R70_PID, BLOODY_A7_PID, BLOODY_A9_PID};
 static const size_t COMPATIBLE_PIDS_SIZE = sizeof(COMPATIBLE_PIDS)/sizeof(COMPATIBLE_PIDS[0]);
 
 static const int A4TECH_MAGIC = 0x07;
diff --git a/README.md b/README.md
index ae882d7..fdcc592 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,21 @@ cmake .
 make
 ```
 
-# Usage
+## Add new bloody devices
+
+1. Get USB PID of device:
+```
+~$ lsusb -d 09da: | cut -d ' ' -f6 | cut -d ':' -f2
+```
+
+2. Add that PID to Mouce.h & Mouce.cpp
+
+Mouse.h: add line with PID and add name to COMPATIBLE_PIDS variable as all the other mouses.
+
+Mouse.cpp: add 3 lines: case, name and break; as all the other mouses.
+
+
+## Run
 ```
 sudo ./bloody
 Available devices: