The single AA flashlights with CREE R3 emitters have a bright HIGH setting(125 lumens) and a 'Lunar LOW'(0.25 lumens), that's great for reading a book or map in the dark without blinding you, or providing navigation on those late night excursions to the facilities. Lights shown with a couple 'star knot' wrist lanyards.
They have a built in clip, so aside from adding them to a lanyard or EDC key chain, they can be conveniently clipped to a pocket or the MOLLE webbing on a backpack or bag.
The whistles are quite loud, so I'd recommend covering your ears to protect your hearing during use. Here's the whistle specs from ITW Nexus.