Name: 2*50W Bluetooth audio power amplifier module with tone Model: ZK-502MT Bluetooth version: 5.0 Input method: AUX+Bluetooth Channel: 2 Adapter power supply: DC9-24V/3A above Adapted speakers: 10-100W, 4-8 ohms Colour:black Material:plastic Size:89 x 60 x 21mm Package Contents: 1 x Bluetooth audio power amplifier module Only the above package content, other products are not included. Note: Light shooting 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.