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Usage: Please refer to instruction manual. Avoid squeezing. Reviews (0). Reviews. There are no reviews yet.Not only your Miniso Bluetooth earphone for many bluetooth earphones these are the reasons for battery drain… The main reason is that if we connect Working frequency: 2.4Hz Transmission distance: 10M Input: AC110-240V Ou Storage: Please refer to instruction manual. Buy it in local store. Buy Preloved Miniso Stereo Sports Bluetooth Headset S3020S (Red) in Singapore,Singapore. Preloved, used only once. Extra earbuds are included. Bluetooth Wireless. Sports In-Ear. Headphones. Carrying case. User manual. Micro-USB charging cable. 3 pairs of eartips.