UltraPower C4SF-HV Receiver [Compatible with FUTAxx S.Bxx 2.4G S-FHxx 4CH Receivers]

✅ [Setup Instructions] ① Binding Procedure - Turn on the S-FHxx/FHxx transmitter and place it 0.5-1 meter away from the receiver. - While pressing the F/S button on the ULTRAPOWER-C4SF-HV receiver, connect the battery to the receiver. - When you connect the battery while pressing the F/S button on the receiver, the red LED will light up and the green LED will turn off while searching for a signal. - When binding is successful, the red LED will turn off and the green LED will turn on.

② Failsafe Settings. If the C4SF-HV S-FHxx/FHxx transmitter has a failsafe function, you can set the failsafe in the same way as the FUTAxx receiver. We recommend setting the failsafe function before use. For example, you can automatically stop throttle operation on your radio-controlled device to prevent the model from flying or driving uncontrollably. (Please note that this does not always work, and that even if it does work, it may not be very effective in some situations.)

③ S.Bxx Output Function Setting This receiver has two operating modes: Special and Normal. In Special Mode, the S.Bxx output function is added to the 4th servo channel. (The other channels 1-3 remain unchanged.)

＊How to Switch Modes - If the receiver and transmitter are linked, turn off the transmitter. - When the receiver LED turns red, press and hold the receiver button for at least 6 seconds (no longer than 10 seconds). Release the button and the green LED will flash. - Press the button again to return the receiver to red. This will change the mode from Special Mode to Normal Mode. - Slow flashing of the green LED indicates a transition from Normal Mode to Special Mode. Fast flashing of the green LED indicates a transition from Special Mode to Normal Mode. Note: When binding the receiver, it will enter Normal Mode. Even if it was already set to Special Mode, it will revert to Normal Mode after rebinding.

✅ [Servo Selection Guide] When connecting analog servos to the receiver, please use Normal mode.

✅ [Signal Level Check] Under normal operation, the signal strength (signal strength) can be confirmed by the illumination of a two-color LED. We recommend checking the operation in advance when visiting a new location or when unusual signal conditions (such as bad weather or an increase in the number of devices emitting radio waves) occur.

✅ [S.Bxx Port Compatible Servos and Gyros] When configured as S.Bxx, the corresponding connection port can only be used with S.Bxx-compatible servos. ✅ [As of May 2025, the latest version of the R4SF receiver for RC cars] The highly requested "vertical insertion connector" and "top-mounted operation switch" have been added, greatly simplifying installation on RC car chassis. The antenna cable has also been changed to one internal and one external for improved handling (Note: The R4SF has two external cables. Dual cables are recommended for 3D maneuverability). For setup instructions, please refer to the product description or download the online instructions via the QR code attached to the product. ✅ [Other Additional Features] A receiver power connector has been added, which was not available on the R4SF (the positive and negative terminals are located on the front of the receiver). The existing water-resistant function has also been enhanced (note that the connector is not water-resistant). ✅ [Compatible Transmitters] Transmitters for terrestrial models: 3PL, 3PV, 3PK, T3PRKA (3PRKA), 4PKS/4PKS-R, 4PLS, T4PX, T4GRS, 7PK. Transmitters for airborne models: T4YF, T6J, T6K, T8J, T10J, T14SG, T18MZ, T18SZ. *Cannot be used with TM-FH modules. *All transmitters operate in S-FHxx/FHxx protocol mode (this receiver does not have telemetry functionality). *Operation has not been tested with transmitters other than those listed, and operation is not guaranteed or supported. Please note that this receiver is not compatible with JR receivers. ✅ [Others] Failsafe function. S.Bxx output is also available on the 4th channel (not available with analog servos). ✅ [Specifications] Weight: Approximately 8g including antenna (Reference: Nominal 8g. Actual measurements are approximately 6.5g including antenna). Size: Approximately 35mm W x 24mm D x 7mm H (connector is approximately 12mm high). Voltage Range: 3.6-8.5V. Operating Current: Max 60mA, 45mA under link. Operating Temperature: -10-70°C. Latency: 13.6mS or 20.4mS. Sensitivity: Approximately -95dBm