... 1)PCB circuit board,2mm 2)BRCM chip 3)430mah lithium battery ITEM :silicone wireless bluetooth ... work current: <5.0MA 7, standby current: 2.5MA 8, sleeping current: <200UA 9, charging ... ion battery Capacity: Minimum 430MAH 15, lithium battery life: 3 years 16, lithium battery Specifications: 4.5 * 24 ... * 47MM 17, key strength: 80 ± 10g 18, key life ...