4
1. Product Layout
1
2
3
4
5
6
7
8
1
9
10
2
11
12
13
14
15
16
17
18
19
20
5
4
3
10
9
5
4
3
2
8
21
17
16
15
1
6
7
1
6
7
8
9
10
11
12
13
14
1
2
3
4
5
10
9
6
7
8
HP36X
HP31X
HP28X
HP21X
HP36X/HP31X/HP28X
HP21X
22
23
24
25
26
27
22
23
24
25
26
No.
Part Name
No.
Part Name
No.
Part Name
1
Channel Selector Knob
10
Microphone
19
P2 Key*
2
Push-to-Talk (PTT) Key
11
LCD Display
20
P3 Key*
3
Volume UP Key
12
OK/Menu Key
21
Keypad
4
Volume Down Key
13
Up Key
22
Accessory Connector
5
Side Key 3 (SK3)*
14
Back Key
23
USB Type-C Port
6
HP36X/HP28X: Top Key (TK)*
HP31X/HP21X: On-Off Key
15
On-Off Key
24
Strap Hole
7
Antenna
16
Down Key
25
Belt Clip
8
LED Indicator
17
Contact Key
26
Battery