Aetertek At-216D Add-on Transmitter Dog Shock Collar Updated Remote Replacement 9V battery Aetertek AT-216D Replacement Transmitter Remote 1 year warranty Highly fit with palm structure and handle it with soft and comfortable feeling. The press button is clear and reasonable for user to easily operate. Gold-plated antenna pedestal and charging head, with outstanding signal emitted characteristic, color will not fade, never oxidized. All our models legally use the 915 MHz frequency segment.