Need Wireless Device (Transmitter and Receiver)

Buy offer Details

Hi, We here is Magnet from Malaysia, we're looking Wireless Device (Transmitter and Receiver) for 3 buttons switch & barrier gate use.
Once the product is suitable after our testing, we'll purchase is long term.
Would you have below items can recommend us ? Or recommend what product you have.

RX-TX Device Require (any model/design also can)
1. Transmitter and Receiver able to support 3 buttons switch (dry contact signal input and output).
2. Frequency range can be 330Mhz or 433Mhz. (Recommended : 433Mhz/low cost)
3. Receiver state : NO (Normally Open)