Anself Automation Relay Module DC5V/2.1A and Discharge Module Boost Module

Features: and discharge at the same times is allowed. Works as a 4.2V/2.1A (on mode); works as a 3.7V to 5V boost module on discharge mode. Over current protection; over voltage protection; short circuit protection; over temperature protection. In discharge mode mode keys function is invalid. With batterys indicator. Specifications: voltage: DC4.5-5.5V current: 0-2.1A Discharge efficiency: max. 96% Item weight: 2g Item size: 27 * 18 * 6mm Package weight: 3g Package size: 29 * 20 * 8mm Packing List: 1 * Relay Module