The moisture meter can quickly measure the moisture content of the grain. 1. CHANNEL 2.1: Sound power amplifier board ma stereo 2.1-channel output, 15W x 2 and 30W output power, audiophile HiFi sound quality, clear and transparent highs, shock growing in bass. 2. KNOB ADJUSTMENT: The power amplifier module uses a special high-end coding knob, which allows continuous tuning in the range of 360 degrees, supports start and stop key, long press causes switching of the device. 3. APPLICATION CONTROL: Bluetooth power amplifier board supports YS app control, support visual playback mode for iOS and Android, support Bluetooth, support name modification, setting connection password, volume, pause in playback, etc. 4. COMPATIBLE DEVICES: The digital power amplifier board has different input and output modes, compatible with almost all home devices such as smartphones, MP3, PC computers, TVs, tablets, laptops, etc. 5. MULTIPLE PROTECTION: The ma built-in multi-purpose protection mechanism with electrostatic protection, overheating, overcurrent and short circuit. . AUDIO AMPLIFIER MODULE YS-E30H STEREO DC 9-24V . AUDIO AMPLIFIER MODULE YS-E30H STEREO DC 9-24V Specification: Item Type: Sound Amplifier Board Material: PCB Power: 15 W x 2 and 30 W Sound channel: channel 2.1 Bluetooth version: 5.1 Sound Input: Bluetooth, AUX Sound Output: Left and Right Channel, Bass Protective mechanism: electrostatic protection, overcurrent protection, short circuit protection, over temperature protection, etc. Special Features: Support for YS application control . AUDIO AMPLIFIER MODULE YS-E30H STEREO DC 9-24V . AUDIO AMPLIFIER MODULE YS-E30H STEREO DC 9-24V List of packages: 1 x Sound Amplifier Board 2 x cover 3 x Knob Cover 1 x Heatsink Block 1 x Adapter 1 x Screwdriver 4 x gold screw post 8 x Black Screws Out of the box . AUDIO AMPLIFIER MODULE YS-E30H STEREO DC 9-24V . AUDIO AMPLIFIER MODULE YS-E30H STEREO DC 9-24V