This device appears to be a silver medallion in the shape of a beetle.

If it is held for 1 round, an inscription appears on its surface letting the holder know that it is a protective device.
The scarab’s possessor gains spell resistance 20. The scarab can also absorb energy-draining attacks, death effects, and negative energy effects. Upon absorbing twelve such attacks, the scarab turns to powder and is destroyed.

Prerequisites: Craft Wondrous Item, death ward, spell resistance.
Cost to Create: 19,000 gp, 1520 XP, 38 days.