Features: 1) Wall-hanger 2) Contact switch 3) Rechargeable battery 4) Use life: more than 2 years 5) Outside adapter: 110V-220V, 50hz-60hz Inner packing: 6pcs/carton Carton dimensions: 52.7 x 45 x 37cm Qty/20 FCL: 1,800pcs Qty/40 FCL: 3,960pcs Qty/40 HQ: 4,860pcs