This is the Futaba R2106GF 2.4GHz FHSS 6-Channel Micro Receiver.

Features:

• Compatible with all Futaba FHSS/S-FHSS transmitters

• Not compatible with FASST systems

• Ideal for indoor flyers

• Offers option of High Speed mode with digital servos and fail safe on all channels

Specifications:
Size: 1.5x.85x.40" (38x21x10mm)
Weight w/Case: 0.14oz (4g)