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⭐ Rated 4.8/5 by 1,000+ customers 🚚 Free Shipping in USA 🔒 Secure Checkout
✔ Relieves back pain fast ✔ Improves posture naturally ✔ Comfortable & adjustable ✔ Invisible under clothes
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Max Sound Output: ≥120 dB Max Sound Gain: ≥30 dB Harmonic Wave Distortion: f<1000Hz≤10%,f>1000Hz≤4% Frequency Range: 250～3800 Hz Input Noise: ≤50 dB Battery: AG5 Working Voltage dc1.5V Working Current: ≤4mA
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