Promate Bolt-20Pro 20000Mah Slim Power Bank with Safe Adaptive Charging for Smartphones and Dual USB 10W Type-C Smart LED Display in Black: From the producer The Bolt-20Pro is designed to be the best multi-device portable power bank. Thanks to its dual USB output ports and USB-C input/output port, this high-capacity 20000mAh power bank guarantees quicker and more intelligent charging. The integrated multi-protection mechanism combines