This is a long distance 2.4G wireless module which basic on nRF24L01+ chip, and there is the PA and LNA circuit on board, with the external antenna it can reach long distance than the one without these parts.
The CC2541 SensorTag is the first Bluetooth Smart development kit focused on wireless sensor applications and it is the only development kit targeted for smart phone app developers. The SensorTag can be used as reference design and development platform for a variety of smart phone accessories.
This is the FPV Bracket Kit For 9g Servo, with the help of this product, it would be easy for you to create 3-axis projects such as environment monitoring, tracking. It would be you good partner in servo related projects.