Your ASSURANCE is my GUARANTEE!
★ Volume Control to Suitable Sound Amplification ★
★ Designed with Maximum Comfort for Long Usage ★
★ Compact & Fashionable ★
★ Lightweight & Easy to Carry ★
★ BEST BANG FOR BUCKS! ★
Item 01: Mini Voice Amplifier (Model: ZDC-900) 
Technical Data
Weight: 110g
Max sound output: 123dB ± 4dB
Max sound gain: 30dB ± 5dB
Equivalent input noise: ≤25dB
Harmonic wave distortion: ≤5.5%
Frequency response: 100~3000Hz
Voltage: 1.4V
Rated current: 1.5mA
Battery type: A312, PR41 (Equivalent Size 312)
Item 02: Rechargable Hearing Aid (Model: ZDC-900B) 
Technical Data
Weight: 100g
Max sound output: 128dB ± 4dB
Max sound gain: 40dB ± 5dB
Equivalent input noise: ≤15dB
Harmonic wave distortion: ≤6%
Frequency response: 100~3000Hz
Voltage: 1.2V
Battery Capacity: 40mA (~ 10 Hours)