This is the Spektrum SRXL2 DSMX Remote Receiver
The Spektrum SPM9747 DSMX SRXL2 Remote Receiver is used to provide additional path diversity using Spektrum's patented MultiLink technology to avoid reflected signal fading and polarization blind spots at long range from the transmitter.
The Spektrum SPM9747 SRXL2 is compatible with all receivers that utilize SRXL2 remote receivers (4-pin connector).
It features an integrated antenna design inside the case to provide easy installation and worry free performance.
Features
SRXL2 Technology
SRXL2 is a powerful bi-directional communications protocol that improves the speed, security, and richness of data transfer between your radio system and compatible on-board devices such as flight controllers and Smart ESCs. You'll also enjoy more responsive telemetry that can be customized precisely to your needs.
Integrated Antenna Design
The SPM9747 DSMX SRXL2 Remote Receiver features an integrated antenna design that allows for quick and easy installation and eliminates concern for damaging wire antennas.
Specifications
Application: Air
Band: 2.4GHz
Bind Method: Bind Button
Data Port: No
Failsafe: Yes
Forward Programming: No
Input Voltage: 3.3 - 8.4V
Integrated Variometer: No
Product Application: Air
Product Height: 0.30" (7.52mm)
Product Length: 1" (25.4mm)
Product Weight: 0.1oz (3g)
Product Width: 0.71" (18.11mm)
Programmable: No
Range: Full
Remote Receiver Ports: 0
Rev Limiter: No
Serial Out: SRXL2
Technology: Standard
Telemetry: Integrated
Telemetry Range: Fly-By