[Buttons and indicators]:Low battery indicator (BATT)Tuner switch (TUNER)VOLUME – Adjusts guitar output volumeMUSIC VOL – Adjusts MP3 playback volumeTF CARD – Supports TF card readingUSB interface – Supports USB drive readingTuner display

The best viewing angle is 0-20 degrees

Size: Square: 7 × 7 × 7

HOLD switch

suitable foot length = 19

Wireless SOS Emergency Call Button Wristband for Seniors & Patients, Rechargeable Personal Emergency Alert Bracelet Color:White [Buttons and indicators]:Low battery indicatorProduct Information: Input Voltage: 3V CR2450 Battery (550mAh) Standby Current: 3 A Alarm Current: 10 mA Alarm Indicator: Red LED Radio Frequency: 315 MHz 433 MHz (75 KHz) Transmission Range: Up to 80 m (Open Area, No Interference) Operating Temperature: 10C to +50C Operating Humidity: <85% Package Includes: 1 SOS Alarm Wristband 1 Charging Data Cable 1 User Manual Product Image: