This is the Futaba PS-01RS Inline 5.0V Single Servo Regulator

Inline 5.0V Single Servo Regulator for 2.4 GHz System (01102286-1)

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MAIN APPLICATION:
4.8 V Specifications Rudder Servos

INPUT VOLTAGE RANGE:
6.0 V ~ 8.5 V

OUTPUT VOLTAGE:
5.0 V

RATED OUTPUT CURRENT:
1.0 A
(Momentary Maximum: 5.0 A)

DIMENSIONS:
24.2 mm x 7.8 mm x 8.3 mm

WEIGHT:
5.2 g

OPERATING TEMPERATURE:
-10 ~ 45° C

STORAGE TEMPERATURE:
-20 ~ 60° C