Promaster Wireless Remote Shutter - Function Identification

Features
Receiver
• Battery type: CR-2 3V lithium battery × 1
• Operating temperature: 5 °C to 40 °C (40 °F to 105 °F)
• Net weight : Approx. 19g
• Dimensions: 47.5 × 38 × 21.9mm
Transmitter
• Battery type: 23A 12V battery x 1
• Operating temperature: 5 °C to 40 °C (40 °F to 105 °F)
• Net weight : Approx. 18g
• Dimensions: 81.9 × 27.3 × 14.5mm
Function Identification
 Transmitter
1 Status LED
2 Shutter button
3 Mode switch
4 Antenna (can be extended)
5 Channel selection switch
6 Battery cover