The Panasonic HX-A1 Action Camera boasts its night capture feature.
Using infra-red in night mode, you can shoot inside caves without light.
Record two different angles using wifi and Wireless Twin Camera (separate camcorder required).
Very small. Size of an average thumb.
Source: Panasonic launches new HX-A1 action camera, and Lumix DMC-G7 – PC & Tech Authority