“Other devices” means manually-emplaced munitions and devices including improvised explosive devices designed to kill, injure or damage and which are actuated manually, by remote control or automatically after a lapse of time.

It is prohibited to use booby-traps or other devices in the form of apparently harmless portable objects which are specifically designed and constructed to contain explosive material.

“Booby traps and other devices” is one legal thing, there’s no legal distinction. Pager bombs are always a war crime regardless of circumstances.