Color	Black	<br />Brand	YONGNUO	<br />Model	YN-E3-RT	<br />Material	Plastic	<br />Quantity	1 Piece	<br />Compatible Brand	Canon	<br />Compatible Models	Compatible with E-TTL II / E-TTL auto flash type A EOS cameras	<br />Effective Distance	100 m	<br />Wired/Wireless	Wireless	<br />TTL Mode   	E-TTL II / E-TTL	<br />Receiver	1 Piece	<br />Channel	16	<br />Working Frequency	2405~2475MHz	<br />Working Voltage   	3 V	<br />Battery Model	AA	<br />Battery included or not	No	<br />Remote Controller Battery Number	2	<br />Packing List	1 x Transmitter (2 x AA batteries、 not included)<br />2 x Shutter release cable (80cm)<br />1 x Protective pouch<br />1 x Chinese / English user manual	<br /><br /><br />Yongnuo Speedlite Transmitter YN-E3-RT wireless flash shooting with a signal transmitter. Can control up to five groups (15 units) with the use of radio transmission for wireless multiple flash shooting function flash. Signal transmitter also has equivalent EOS-1D series camera dust and water droplets performance. 2.4G two-way radio communications、 wireless signal is fully compatible with the original ST-E3-RT / 600EXRT; 15 physical channels、 an automatic channel、 you can set as many as 10、000 photographers ID、 professional occasions without interference; Farthest communication distance over 100 meters; Multiple YN-E3-RT can be shared using the same off-camera flash; Can display off-camera flash grouping、 Call Information; Firmware upgradeable via USB port; High-resolution dot matrix LCD screen、 backlit buttons; Dustproof and waterproof quick-locking mechanism; Built-in AF assist lamp、 buzzer; Wireless shutter control、 online shooting; ETTL / M / Multi / GR 4 flash modes; A / B / C / D / E of five flash grouping; Control up to 15 off-camera flash; Support for front -curtain sync、 rear-curtain sync (M mode)、 high-speed sync; Support ETTL light ratio、 exposure compensation、 exposure lock、 exposure bracketing、 modeling flash; 9 Custom Functions; Settings are automatically saved<br /><br />                                                    <br />                                                                            Dimensions: 3.19 in x 2.68 in x 2.68 in (8.1 cm x 6.8 cm x 6.8 cm)<br />Weight: 3.88 oz (110 g)<br /><br />                        <br />                                            <br />                <br />