Optical is the warmest and most charming of tremolo genres, and this one has the added bonus of being extra tiny. 

Model: Mooer Trelicopter
Made: China, recent model (serial 2161574)
Type: optical tremolo
Power: standard 9v negative supply, not included
Switching: true bypass
Equivalent new street price (approx): $109aud
Mods: none
Accessories: original box
Condition notes: used, few minor marks, fully functional. Overall: excellent condition