Hollyland WTS-TL01 Tally LightThis Tally Light is designed for use with the Hollyland Wireless Tally System. It boasts switchable 3 level brightness, a transmission range of up to 2600', and a transmission delay of <150 ms. It comes with a lithium ion battery pack and a set of number stickers you can use to easily identify multiple units when using multiple devices. Features Compatible with Wireless Tally System 2600' Transmission Range, <150 ms Delay Switchable 3 Level Brightness