Features 1、This power amplifier is designed with a protective case, overvoltage protection, undervoltage protection, overheat protection. 2、5.0 BT version, this audio amplifier module has higher transmission efficiency and longer transmission distance. 3、Made of high‑quality materials, this BT power amplifier is durable, wear‑resistant and rust‑resistant. 4、Multiple input modes to meet the needs of various work scenarios, withstands large currents, and does not generate heat. 5、Wide range of uses, the speaker can be used in sound engineering, electronic equipment, etc. to amplify digital audio signals. Specification Item Type: Audio Amplifier Module Material: Aluminum alloy Model: ZK-502D BT Version: 5.0 (Unobstructed, 15 Meters) Signal to Noise Ratio: >95 dB Input Method: USB + AUX + BT Number of Channels: Left and Right Dual Channels (Stereo) Power Amplifier Chip: TPA3116D2 (with AM Interference Suppression Function) Adapter Power Supply: DC 9-24V Adapted Speakers: 15-100 W, 4-8Ω Output Power: 15w x 2 at 12v, 8Ω 30w x 2 at 12v, 4Ω 20w x 2 at 19v, 8Ω 40w x 2 at 19v, 4Ω 30w x 2 at 24v, 8Ω 50w x 2 at 24v, 4Ω Purpose: Change the Sound Signal Applicable Scenarios: Audio Equipment, Electronic Equipment, Sound Engineering Package List 1 x Wireless Audio Receiver