Wireless transmitter for digital instruments, Relay G10S (transmitter is G10TII). Regarding the battery life of the Relay G10TII transmitter, the manufacturer's product description states a maximum of 7 hours. However, when I tested it by playing music continuously on a full charge, the red light started flashing when the remaining battery was within 30 minutes. Even after 8 hours, the LED indicating the battery level remained green. The battery life seems to be as good as new, or even better. I think it's quite a good piece of equipment. - Model Name: RELAY G10S (transmitter is G10TII) - Type: Digital instrument wireless receiver and transmitter Thank you for viewing.