This is the Futaba R304SB 2.4GHz FHSS 4-Channel Telemetry Receiver.

FEATURES: Used with the Futaba 4PLS 2.4GHz T-FHSS Radio One year limited warranty through Futaba beginning at date of purchase

INCLUDES: Futaba R304SB 2.4GHz FHSS 4-ch Receiver

SPECS: Power Requirement: 4.8 - 7.4V battery (dry cells cannot be used) Receiving Frequency: 2.4GHz System: T-FHSS (auto detection) Dimensions: 1.38 x 0.91 x 0.33" (35.1 x 23.2 x 8.5mm) Weight: 0.23oz (6.6g)  

BOX DIMENSIONS: 2.63" W. X 1.38" H. X 3.38" L. BOX WEIGHT: .09 LBS.