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433 MHz Wireless Transmitters and Receivers. Delay or no delay programming options (i.e. vestibule applications). Up to 100 transmitters can be programmed into a single receiver. Can remove transmitter codes individually or all at once. Ideal for wireless activation and/or sequencing of automatic doors. Universally compatible with all types of automatic doors. Extended hold time receiver available to hold door for as long as button is pressed. Toggle or pulse mode selectable by DIP switch. 0.5 or 10 second relay hold time. Field replaceable 9V battery (10TD433PB9V).