for SM2/SM4 is a remote control (the latest model) with a sturdy black casing Simply program the receiver or access the control panel. This for remote control is not compatible with the for Flor& radio controller. Use security: dynamic code provides a of security, non-copyable code. Type: For use with receiver programming Frequency: 433.92mhz Code:Rolling Code Channels:2 / 4 Buttons Distance:Open space 10m-150m Remote Control Model:for SM2;for SM4 Receiver Models:SMXI,SMXIS,SMX2,SMX2R,OXI,OX2 Access to receiver required. Please make sure you got access to your receiver/opener before purchase. Due to different factory batches, the product words are different, and the product accessories have slight differences in color and appearance, but it does not affect normal use Each remote control comes with 23A dry cell battery Colour:Black Material:ABS Package Contents: 4 x 433.92mhz rolling code 2-button remote control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.