ZK-TB21 PRO 2.1 Channel Stereo Bluetooth Amplifier ($20.87)

Best discount available now: $20.87 (Banggood). Updated: 16-12-2025.

ZK-TB21 PRO 2.1 Channel 5.2 Stereo bluetooth Amplifier Board 50W+50W+100W TPA3116D2 Chip AUX Amplifier – Black
Banggood warehouse: China.

Price: $20.87

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There’re some similar (or not) items on Aliexpress

Image	Product (link)	Price	Coupons
	ZK-TB21 PRO 2.1 Channel 5.2 Stereo bluetooth Amplifier Board 50W+50W+100W TPA3116D2 Chip AUX Amplifier	$29.51	–
	2X DAJUNGUO ZK-TB21 PRO 2.1 Channel 5.2 Stereo Bluetooth Amplifier Board 50W+50W+100W Uses TPA3116D2 Chip AUX Amplifier-[A49T]	$52.36	–

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