This is a holder for the RX5822 32 channel 5.8 GHz video receiver that is sometimes sold under the Boscam brand and sometimes without any branding. The receiver is in any case both cheap, good, small and lightweight, so I recommend it.
The holder uses standard rubber hair bands to hold the receiver in place. The receiver is held firmly, but can be removed in seconds.
All the connections on the bottom of the receiver are accessible and so are the buttons on front of the receiver.