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Product characteristics: Material: PC， ABS， silica gel

Size: 195 mm x 35 mm

Weight: 200 grams.

Volume: less than 49 dB.

Waterproof: anti fly splash

Battery: lithium ion battery， the 700mAh 3.7 volt (rechargeable)

Frequency range: 80-100Hz， 160Hz (max)

Input voltage: 5 V