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USB Power Bank Winter Handwarmer Rechargeable Hand Warmer. Adjustable Temperature: Temperature can be freely adjusted from 40 to 60 degrees. Multiple Capacity Options: Available in 6000mAh, 8000mAh, 9000mAh, and 10000mAh. Custom Logo Printing: Logo printing is accepted with free artwork approval. Multi-Function Design: Serves as both a hand warmer and a portable power bank. Comprehensive Certifications: Products comply with CE, RoHS, FCC, Reach, MSDS, and UN38.3. No MOQ Requirement: Small orders as low as 10 pieces are accepted. Durable Material: Constructed from high-quality ABS and aluminum. Safety Protection: Features over-discharging, short circuit, and over-charging protection.