25G Shockwatch® 2 Indicators. Bi-directional, vertical response impact indicator detects mishandling of products turning transit or storage. Devices turn bright red when an impact occurs._x000D_ Activate devises by removing adhesive liner._x000D_ Small, 1 2/3 x 1 2/3" indicator with optional, 3 3/4 x 3 3/4" label for added visibility._x000D_ Unique serial number for tamper-proof tracking._x000D_ Companion labels SHWCL (sold separately) inform handlers of the proper procedures to follow when in receipt of damaged shipments._x000D_ Alert Tape SHWAT (sold separately) warns that package is being monitored.