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Product Name:Digital mini professional portable speaker with lithium battery and AAA Ni-MH battery design can last stand-by time and perfect for outdoor activities, tour guide, teachers, conference, outdoor lecture, parade, assemblyetc. Features: - With lithium battery and Ni-MH battery adjustable design - Compact and elegant design, durable ABS construction - Unique Automatic Anti-Feedback System - Totally mobility and portability -Heavy duty yet lightweight design - More than 15 watts output - Mini size: 112mm x 85mm x 42mm - FlexibleHeadset Microphone - Adjustable waistband Function: 1. Multifunctional digital amplifier all in one with microphone, AV amplifier and loudspeaker 2. Adopt high-tech digital circuit technology and SMT, which have full advantage in keep a perfect vocal and howl-proof ability. 3. With Audio-in functions, it’s perfect for anywhere you want to listen music and programs. 4. With low power consumption and lithium battery and Ni-MH battery adjustable design, which can supply power in 30 hours continuously 5. The output power is up to 15W and with clear voice, high penetration, that the sound can cover 400 square meters. 6. With high class headset microphone, which suitable for adorn, high sensitivity and super-cardioid directional design, howling cancelling. Technical Parameters: Maximal Output: 15 W Frequency Output: 70Hz-12kHz Output impedance: 4Ω Operation Voltage: 6-8.4 V Recharging Time: 6-8 H Battery Charger: DC 9V/400 MA Battery Working Time: 16-30 HMaster Weight: 260 G Material: ABS Product Dimension: 112mm x 85mm x 42mmContent: Master Amplifier 1PC Qualified Microphone 1 pc Battery Charger 1pc Audio Wire 1 pc Portable Bag 1 pc Manual 1 pc Warranty Card 1 pc Certification 1 pc Attention: When the machine is without enough power, pls. charge the battery in time. If you don’t use for a long time, it is better for u to charge the battery once a month. Pls. don’t input the outside sound signal(such DVD, CD, MP3) from the MIC IN plug but from AUX IN plug and lower the sound volume firstly, avoid whistle. In order to get perfect sound quality, pls. direct to speak at the microphone cartridge, and avoid the microphone cartridge direct to the loudspeaker. Pls. store the amplifier in the dry circumstance to expand the product life span. Non-specialist, pls. don’t open the machine to repair. Any problem, pls. contact the local distributor directly. In order to keep best performance of the product, pls. use our matched charger We have right to improve or modify the instruction content, and wont notify you in advance! Thank you