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Product Name: Big Dog Head Audio can be connected in series), Small Dog Head Audio cannot be connected in series without an audio port). Power mode: USB. Frequency response range: 100HZ-20KHZ. Connection method: Bluetooth connection. Rated voltage: 220. Additional features: card insertion. Bluetooth version: 4.1. Number of speakers: 1. Product Number: Bulldog Sound System. Applicable scenarios: desktop, outdoor, home, live streaming. Rated power: 5. Built in battery: Built in battery. Box material: plastic. Waterproof grade: non waterproof. Horn unit: 1 unit. Effective distance: 10 meters. Signal to noise ratio: 75dB. Function: Bluetooth TF card radio 3.5 audio connection 1+1 series connection. Big Dog Head Sound 1+1 Series Connection Method: Two speakers are turned on simultaneously, and then press and hold the M button mode key at the same time. When the beep prompt sound is heard, pairing is successful. Use Bluetooth on your phone to search for pairing and play music. Description