Braun treasure monitor BLB-36 type and Braun treasure locator BLB-77 type with hypoallergenic silicone production, contact soft skin-friendly, environmentally safe, non-toxic, body low radiation, convenient speakerphone, one-touch dialing shortcuts, you can assured to the family to wear. Instrument selection of Swiss U-BLOX GPS chip, low power consumption, high sensitivity anti-interference, precise positioning, industry-leading; GSM quad-band world wide; host light weight to 60 grams, voltage and current of 3.7 volts and 20 mA; larger volume , clear sound; battery life lasting, industry-leading battery life.