Cool Tech RSF08SB 8CH Compatible Receiver for Futaba S-FHSS S.BUS 14SG 10J 8J 6J 4GRS 4PX Transmitter Description: Item: RSF08SB Receiver Specifications: 47.5 X15 X25.3 mm Input voltage: 3.5 ~ 8.4 V Signal period: 14ms (mode FS) 7ms (mode HS) Weight: 11 g Compatibility: Futaba S. BUS servos, Futaba 10J, 8J, 6J, 4GRS, 4PX, etc. Package Included:1 x RSF08SB Receiver