The WR-100 maximum operating range 100m. (The operating range may be obstructions or interference with other electronic equipment to reduce the distance). The WR-100 inbuilt High Capacity Li-ion battery. Take out the power adapter, plug it into the power socket of the transmitter and then plug the power adapter to the power outlet. When the transmitter is under charging, the light of transmitter is on. There are 5 lights, each light represent 20% of battery power. When all of the lights are on, which mean the battery is full, please take of the power adapter.
