The sequel to the popular Firefly remote the Firefly II remote comes in both 300 MHz and 310 MHz frequencies. Compatible with both the Multicode® and Linear DT® line of transmitters. The Firefly II has a new case design with a deeper recessed button. The Firefly II uses 2 CR2016 3V batteries and includes an easy clip keyring. Have you used this remote or the other Firefly remote? We would love to hear what you think.