Brand: QTKJ This Bluetooth module is compatible with O*TIS elevator commissioning and debugging. It supports various main boards, inverters, door operators, and steel belt inspection devices for O*TIS, XIZI-OTIS, XIO, Youmai, SURAPID, and other related brands. User manual documents will be provided with the shipment. If you need any technical assistance, please contact our customer service team after receiving the product.