Philips Norelco OneBlade Body Groomer & Trimmer QP1924/70 $43.18 + Delivery ($0 with Prime/ $59 Spend) @ Amazon US via AU

From website:

Unique OneBlade Technology: fast-moving cutter (100x per second) powers through any length of hair, while skin protector and rounded tips protect your armpit and pubic skin
SkinProtect blade, with triple protection system - rounded edges, bridge and rounded tips, is designed to prevent nicks, cuts and irritation, offering extra safety
Shave and Trim with extra skin protection with just one device – the attachable 3mm body comb makes it fast and easy to trim intimate hair in any direction
Durable stainless steel blades last up to 4 months (For best shaving experience. Based on 2 full shaves per week. Actual results may vary)
Fully waterproof (IPX7), you can shave wet or dry, with or without foam, even in the shower; it is easy to clean, just rinse it under the tap
Rechargeable Ni-MH battery delivers 30 minutes of shaving pleasure after an 8 hour charge; you can charge it anytime and anywhere, perfect for your daily routine and for travel