Followings are few observations,
You have already converted path to lower i...

Followings are few observations,

1. You have already converted path to lower in device_detector.module LN#122 and again converting coverted string at device_detector.common.inc LN#18
2. I'll encourage you to set 'device_detector_node_urls' variable converting all paths to lowecase to avoid doing so while prerocessing html device_detector.common.inc LN#21 & LN#25
3. Please update comment or correct the assignment // Body class container array. $body_classes = '';
4. Please remove
   default: break;

   from device_detector.module LN#198

5. Is it possible to prefix module name to following variables to have a consistency
   1. is_body_settings_chkd will change to device_detector_is_body_settings_chkd
   2. is_brwsr_settings_chkd will change to device_detector_is_brwsr_settings_chkd
   3. is_dsktp_settings_chkd will change to device_detector_is_dsktp_settings_chkd
   4. is_dvc_settings_chkd will change to device_detector_is_dvc_settings_chkd

Please lemme know if you need more info on above suggested changes.