Function: 1.Control channel group (from 1:2 to 1:15) 2.LCD display and saving power mode. 3.Function: display COPY and RANGE. 4.Replace battery (1 CR2032 3V), data still saves latest resetting. 5.Button: Up, Stop. Down, Channel selection and Function switch. 6.Radio frequency: 433.92Mhz. 7.Transmitter size: 12(L) x 4.5(W) x 1.5(H) cm 8.Material: ABS