-(NSString *)getDevice{
    // vars
    NSString *this_device = @"";
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *machine = malloc(size + 1);
    sysctlbyname("hw.machine", machine, &size, NULL, 0);
    machine[size] = 0;
    NSString *machineString = [NSString stringWithFormat:@"%s", machine];
    //NSLog(@"%s", machine);

    // check
    if([machineString isEqualToString:@"iPad1,1"]){
        // set
        this_device = @"iPad1";
    }
    else if([machineString isEqualToString:@"iPad2,1"] || [machineString isEqualToString:@"iPad2,2"] || [machineString isEqualToString:@"iPad2,2"] || [machineString isEqualToString:@"iPad2,4"]){
        // set
        this_device = @"iPad2";
    }
    else if([machineString isEqualToString:@"iPad3,1"] || [machineString isEqualToString:@"iPad3,2"] || [machineString isEqualToString:@"iPad3,3"]){
        // set
        this_device = @"iPad3";
    }
    else if([machineString isEqualToString:@"iPad3,4"] || [machineString isEqualToString:@"iPad3,5"] || [machineString isEqualToString:@"iPad3,6"]){
        // set
        this_device = @"iPad4";
    }
    else if([machineString isEqualToString:@"iPad4,1"] || [machineString isEqualToString:@"iPad4,2"]){
        // set
        this_device = @"iPadAir";
    }
    else if([machineString isEqualToString:@"iPad2,5"] || [machineString isEqualToString:@"iPad2,6"] || [machineString isEqualToString:@"iPad2,7"]){
        // set
        this_device = @"iPadMini";
    }
    else if([machineString isEqualToString:@"iPad4,4"] || [machineString isEqualToString:@"iPad4,5"]){
        // set
        this_device = @"iPadMini2";
    }
    else if([machineString isEqualToString:@"iPhone1,1"]){
        // set
        this_device = @"iPhone2G";
        deviceWidth = 320;
        deviceHeight = 480;
    }
    else if([machineString isEqualToString:@"iPhone1,2"]){
        // set
        this_device = @"iPhone3G";
        deviceWidth = 320;
        deviceHeight = 480;
    }
    else if([machineString isEqualToString:@"iPhone2,1"]){
        // set
        this_device = @"iPhone3GS";
        deviceWidth = 320;
        deviceHeight = 480;
    }
    else if([machineString isEqualToString:@"iPhone3,1"] || [machineString isEqualToString:@"iPhone3,2"] || [machineString isEqualToString:@"iPhone3,3"]){
        // set
        this_device = @"iPhone4";
        deviceWidth = 320;
        deviceHeight = 480;
    }
    else if([machineString isEqualToString:@"iPhone4,1"]){
        // set
        this_device = @"iPhone4S";
        deviceWidth = 320;
        deviceHeight = 480;
    }
    else if([machineString isEqualToString:@"iPhone5,1"] || [machineString isEqualToString:@"iPhone5,2"]){
        // set
        this_device = @"iPhone5";
        deviceWidth = 320;
        deviceHeight = 568;
    }
    else if([machineString isEqualToString:@"iPhone5,3"] || [machineString isEqualToString:@"iPhone5,4"]){
        // set
        this_device = @"iPhone5C";
        deviceWidth = 320;
        deviceHeight = 568;
    }
    else if([machineString isEqualToString:@"iPhone6,1"] || [machineString isEqualToString:@"iPhone6,2"]){
        // set
        this_device = @"iPhone5S";
        deviceWidth = 320;
        deviceHeight = 568;
    }
    else if([machineString isEqualToString:@"iPhone7,2"]){
        // set
        this_device = @"iPhone6";
        deviceWidth = 375;
        deviceHeight = 667;
    }
    else if([machineString isEqualToString:@"iPhone7,1"]){
        // set
        this_device = @"iPhone6+";
        deviceWidth = 414;
        deviceHeight = 736;
    }
    else if([machineString isEqualToString:@"iPod1,1"]){
        // set
        this_device = @"iPod1";
        deviceWidth = 320;
        deviceHeight = 480;
    }
    else if([machineString isEqualToString:@"iPod2,1"]){
        // set
        this_device = @"iPod2";
        deviceWidth = 320;
        deviceHeight = 480;
    }
    else if([machineString isEqualToString:@"iPod3,1"]){
        // set
        this_device = @"iPod3";
        deviceWidth = 320;
        deviceHeight = 480;
    }
    else if([machineString isEqualToString:@"iPod4,1"]){
        // set
        this_device = @"iPod4"; // retina
        deviceWidth = 320;
        deviceHeight = 480;
    }
    else if([machineString isEqualToString:@"iPod5,1"]){
        // set
        this_device = @"iPod5"; // retina 568
        deviceWidth = 320;
        deviceHeight = 568;
    }
    else if([machineString isEqualToString:@"i386"]){
        // set
        this_device = @"Simulator";
        deviceWidth = 320;
        deviceHeight = 568;
    }
    else if([machineString isEqualToString:@"x86_64"]){
        // set
        this_device = @"iPhone Simulator";
        deviceWidth = 375;
        deviceHeight = 667;
    }
    else{
        // set
        this_device = @"Unknown";
    }

    // dealloc
    free(machine);

    NSLog(@"this device is %@", this_device);

    return this_device;
}