These Smiley Face fixation targets have long-lasting lithium batteries. Yellow and blue lights flash on and off around the face. Targets can be hand held or attached to any object with tape or a magnet. Set includes two (2) Flashing Smiley Face Targets with 9mm magnetic disks and double-sided tape for mounting. Attaches to retinoscopes or ophthalmoscopes. Just twist to turn on/off.
Measurements: 30 mm in diameter.