The case mainly has a power out socket connected to the battery through the circuit board, {TAIL ~ a power input socket} connected to {HEAD ~ the battery} and a power supply switch connected between the circuit board and the battery 
The case mainly has a power out socket connected to the battery through the circuit board , { TAIL ~ a power input socket } connected to { HEAD ~ the battery } and a power supply switch connected between the circuit board and the battery
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH