Durable and wear-resistant: metal shell material, durable, impact and wear-resistant. Hd advertising screen: 21.3inch / 1080*1920px advertising screen, custom play ads. Communication is not limited: 4G+WIFI, support global network. High quality battery cell: The use of high quality lithium polymer battery cell, in line with the national standard GB31241-2014/ national standard CB and other safety certification, more durable. Easy maintenance: The modular design of the three-dimensional cabinet makes the borrowing and returning of the charging bank more convenient, easy to install and maintain. Automatic cable management: The design of automatic cable storage slot makes cable arrangement easy and fast. Multi-interface compatibility: The built-in micro USB and type-c data cable can meet the charging needs of a variety of mobile phone models, which is convenient and efficient. Anti-theft: The Hall anti-theft detection system is added at both ends of the charging treasure to effectively prevent people from returning the charging treasure without authorization. Explosion-proof damage: The use of electronic locks for strong reinforcement, to prevent human factors from violent damage, to avoid accidents such as explosions. Safety: Built-in multiple safety protection circuits such as overcharge, overdischarge and short circuit protection. Widely used scenarios: airports, hospitals, shopping malls, hotel lobbies and public places.