?Additional Function?High resolution Dot-Matrix LCD, Backlight for LCD/keys; Supports ETTL Ratio, Flash Exposure Compensation, Flash Exposure Lock, Flash Exposure Bracket, Modeling Flash, Built-in AF assist beam emitter, buzzer, 9 Custom Functions. ?Remote shutter release, Linked Shot ?New designed select dial and display interface for easier operation. Supports remote control to set the focal length (ZOOM) of the slave flash (Compatible with YONGNUO compatible flashes only). Firmware can be upgraded via USB(Micro-USB). ?Multi YN-E3-RT II can share slave flashes?15 Physical Channels, 1 Auto Channel, Up to 10,000 customizable photographer ID. Transmission Range: 100M. Multi YN-E3-RT II can share slave flashes, display group/charge status of slave flashes. ?4 Flash Modes, 5 groups? ETTL, M, Multi and GR flash modes. Up to 5 groups (A/B/C/D/E) and 15 units. Supports 1st curtain, 2nd curtain(Only in M mode), high speed sync. ?Compatible Canon Cameras? 70D, 60D, 50D, 40D, 30D, 100D, 80D, 5DIV, 6DII, 5DIII, 5DII, 5D, 6D, 7D, 7DII, 1D, Rebel T5i, Rebel T4i, Rebel T3i, Rebel T2i, T1i, Rebel XSi, Xti, Rebel XT, Rebel XS, EOS R; Canon speedlite: 600EX (II)-RT 430EX III-RT; YONGNUO speedlite: YN600EX-RT (II), YN968EX-RT, YN686EX-RT, YN680EX-RT. ?Two-way 2.4G radio communication, fully compatible with the Canon 600EX-RT flash speedlite and the ST-E3-RT transmitter?Two-way 2.4G radio communication, fully compatible with ST-E3-RT, 600EX-RT, YN E3-RT, YN968EX-RT, YN600EX-RT(II), YN686EX-RT, YNE3-RX.Mounting Type: Surface Mount. Wireless Communication Technology: Wi-Fi. Connectivity Technology: Wireless. Color: Black. Item Dimensions LxWxH: 3.54 x 3.94 x 2.95 inches. Included Components: 1 x Protect bag, 1 x Original box, 2 x Shutter release cable for Canon camera, 1 x YN-E3-RT II Flash Speedlite Wireless Transmitter, 1 x Manual in English and Chinese See more. Camera Flash: Slave. Compatible Mountings: Canon. Brand: YONGNUO. Manufacturer: HK YONGNUO LIMITED. Date First Available: September 5, 2018. Is Discontinued By Manufacturer: No. Best Sellers Rank: #61 in Photographic Lighting Remote Triggers. Customer Reviews: 4.6 out of 5 stars 169 ratings 4.6 out of 5 stars. Item model number: YN-E3-RT II. : B07H3MFSM2. Item Weight: 5.6 ounces. Product Dimensions: 3.54 x 3.94 x 2.95 inches.