Usage Tips: For SMILO SM2/SM4, this remote control (latest model) features a durable black casing. Simply program the receiver or access the control panel. This remote control is not compatible with Flor& radio controllers. Security: Dynamic rolling code provides a high level of security and is non-copyable. Type: Designed for receiver programming Frequency: 433.92 MHz Code: Rolling Code Channels: 2 / 4 Buttons Range: 10m–150m in open space Remote Control Model: For SMILO SM2; For SMILO SM4 Receiver Models: SMXI, SMXIS, SMX2, SMX2R, OXI, OX2 Access to the receiver is required. Please ensure you have access to your receiver/opener before purchase. Due to different production batches, product labeling may vary and accessories may have slight differences in color and appearance, but this does not affect normal operation. Each remote control includes one 23A battery. Color: Black Material: ABS Package Contents: 4 x 433.92 MHz Rolling Code 2-Button Remote Controls Package includes only the items listed above; other items are not included. Note: Lighting effects and display settings may cause slight color variations between the image and the actual item. Measurement error allowance: ±1–3 cm.