Futaba R334SBS-E T-FHSS SR S.Bus2 4-Channel 2.4GHz Receiver. This receiver is recommended for electric models only. 

NOTE:

• This receiver is not compatible with gas powered models. Gas powered models should use the R334SBS receiver (FUTL7688).
• SR mode servos must be used when using T-FHSS SR mode. Use of normal servos may cause servo trouble.
• Not compatible with the Futaba FHSS, S-FHSS, FASSTest or FASST transmitters.

Features:

• Surface 4ch 2.4GHz T-FHSS SR Diversity
• 2.4GHz T-FHSS S.BUS2
• Frequency 2.4GHz
• Surface Use
• 4 Channel

Specifications:
Input voltage: 4.8-7.4V
Weight: 7.2g
Dimensions: 33.9×22.3×11.3mm (3 × 2.5 × 1.5 in)