No, you don’t have to pair the Bike combo kit. It features a wireless broadcasted emission (which is different from the Pocket Mate). Once triggered by your movement, the snesors send your cadence/speed to any device in its proximity area. However, once your device is connected, other devices will not be able to connect to the Bike combo kit as every connection is unique and coded.
Because of that, it’s important that while pairing the Bike combo kit to the app, you remain a safe distance (at least 20~30 m) from other transmitting Bluetooth devices to avoid interference problems during connection.